Let me start of with saying that the game isn't that bad but It does have some flaws.
The game isn't for everyone but honestly i have seen games way worse than this one.

I don't want to come of as acting all pro... But after playing CS:GO on a certain level this game was just too easy for me.
There wasn't much of a challenge because of a few reasons.
For example, there are enough weapons on the ground and they are all in 1 spot.
All the weapons are loaded with enough ammo so you never really run out.
The stages are short! You kill waves of zombies and it ends with a boss.
Sometimes the boss is looking big and mean but is shot dead with 3 head shots. lol
The zombies weren't that fast either... It wasn't like they were hunting you down and you had to be fast.
There is no time pressure, You don't have to hide and you don't have to look for a gun or ammo.

Now i probably sound too negative, But in all honesty I didn't think this game was that bad.
The game looked decent and the weapons worked fine.
For me the game ran smoothly and no crashes or glitches occurred.
The fun part for me was the large variety of weapons to choose from.
I was also pleasantly surprised with the variety in the maps.
But the biggest plus of this whole game was for me the achievements.
The developer is also kind enough to let the buyers create their own achievement.
I can't thank the developer enough for the opportunity to have my own personal achievement in the game.
Which other game gives you the opportunity to get your own custom achievement?
That alone was worth a thumbs up for me already.

In all honesty it won't even matter what my personal experience is with the game.
This review will probably get down voted into oblivion just like the others that dared to up vote it.

Just don't expect too much when you decide to give this game a try... it won't be the next Call Of Duty: Zombies!
But if you like to mess around, sit back, relax and brainlessly kill zombies with different kind of weapons.
Or you like achievements and want your own custom achievement in a game then this game is for you!

Remember those kids at school who did nothing except copy other people's homework and copy-paste stuff off of Wikipedia?

Well, turns out they grew up to make games.

I use the terms "make" and "game" very very generously.

It is still early access so this isn't the final judgement, but so far:

-You can't host servers and there is only 1 server available so there just aren't a lot of options.
-The weapons are massive because the developer was too lazy to scale them to their correct size.
-If you hear a roar and say to yourself "Hey, that sounds an awful lot like a T-Rex. You are correct. There are random T-Rex roars in the background for seemingly no reason. Probably has to do with the fact that the other game this developer made was a dinosaur hunting game.
-The Campaign mode is just really easy survival rounds each level having 3 waves, the first two waves are zombie waves having on average 3 zombies, and the last wave is the boss zombie. Very easy, no challenge.
-Guns are clunky and don't move when you fire them.
-The campaign mode is somewhat new and needs work. Right now "Campaign Placeholder" is on the intermediary slides between levels instead of a title.

This game is still early access and it seems like the developer has been making semi-regular updates, so we'll see where this game goes.

EDIT(After Developer Comment and game update): Ok so the developer actually listened and fixed quite a few things that I was complaining about. It's nice to see a developer who is active in improving his/her game. Anyways,
-Guns are now the correct size!
-The Map is very much improved, well done.
-The campaign no longer has placeholders for the transition slides and is improved overall with number of enemies
-There still isn't a very big community playing online, but if it keeps updating and more servers(or the ability to host servers) are made available then I can definitely see more people playing it.

Neither intense nor expansive.

Too early to be considered a game and not even worth the $2.99. You can see more in pretty much any demo of any game ever made. Thumbs down until there is some form of actual gameplay. I don't recommend tech demos.

The videos are a pretty accurate depiction of what you get with this game. In fact thats ALL you get with this game. They have shown EVERYTHING in the game, the only difference is you don't start with an axe or a flamethrower. According to the developer these can be found in crates (I didn't find any).

Multiplayer consists of one server with a building and some boxes. No players or zombies and no terrain at all.

Single player is a small underground bunker with a few "zombies" that kill you IN ONE HIT. You don't have a weapon so no gameplay there unless you consider running from zombies until you get cornered in a 3 bedroom bunker gameplay (or you manage to find a weapon). Well hey, it worked for Pac-Man.

You can exit the bunker but you end up in an unpopulated terrain with a couple of buildings and nothing else (although I hear there might be animals around).

The interface and ui is more complete than most early access games. Keymapping works and you can turn off the music.

There is some potential but when developers release things like this so early I have nagging doubts, although to be fair the developer did respond to this review and posted a patch to the game so those are good signs.

Bought it for the Twice achievment

The entire point of this game seems to be to drop ridiculous amounts of achievments very quickly. Zombies are easy to kill, you basically have infinite ammo, as there are always weapons available. The hardest part of this game is to die - you literally have to stand still swarmed by zombies and wait about a minute for them to kill you.

This game has 1095 achievments, which all drop within about 10 minutes just from things like turning on a flashlight and killing zombies. Your screen will practically be flooded with achievments as you play. Personally it bugs me to have that many achievments drop so rapidly for doing essentially nothing, but if you really want to boost your achievment stats, this game is for you.

If you are entertained, as I was, at watching 1000+ achievements trigger over the course of an hour, you may find it enjoyable. Otherwise, it has no real purpose.

It isn't an horrible game, even more so for the asking price. Also the fact that you can get all 1095 achivements done within 30 minutes is it more of achivement farming game, but it still isn't a bad game and I can see myself coming back to play it more in the future.

Overall I didn't have any real performance issues other than when throwing grenades it would sometimes lock up for about 10 seconds. The character movements are janky and the assets are uninspiring but till I do give it a recommend due to price, and achievements as well as the price. Hard to beat a game under $1 USD that at least managed to give me what I felt was my monies worth and I plan on coming back to.

Terrible.
I buy too many games, I enjoy few of them and sometimes I see their price (of course I buy them or with a 90% coupon or with a 90% sale) and see that games like these cost 5€.
Apart from that, there's nothing interesting to say about this game.
It's a repetitive and boring first person shooter in which in the same snowy setting you shoot things that like the sketches for the first Mortal Kombat games on the SNES, they should be zombies probably but it's so crappy that Idk.
Of course you have the whole range of shooting weapons, rifles, guns, pistols, whatever. It's all the same, since the game has no purpose, you just shoot things up and get achievements.
There are different modes, but they are all the same ♥♥♥♥. Shooting things, hearing horrible music, running and jumping here and there, dying, unlocking achievements (they're not bugged at least)..
Since you basically are provided with infinite ammo it isn't even important the weapon you're using or you find, you can kill the zombies in any way you want. Achievements of course drop randomly when you kill them, like 10 or 20 at a time.
As I said, there are some modes but they're all the same with no purpose. The campaign mode puts you in a randomized environment, and the enemies are all weak as always. The "bosses" actually are just larger zombies. The whole game poses no difficulty at all.
And for the multiplayer mode well, it's not needed and it's like one server and nothing more.
If you want lots of achievements, at least wait for a 90% sale 'cos really I've never seen a game so costly and soo poor overall. I mean, from the same developers crappy games like Dinosaur Hunt (which are the exact copy of this one, with dinosaurs instead of zombies) come at 1€ full price..
For every other aspect, there's no fun at all.

I think throwing that 49 cents at random people wouldve been more worth it.