A pretty addictive rogue-like dungeon crawler. This game doesn't look like much at first, but you'd be wrong to judge it on first impressions.
You play as Isaac, and your goal is to make way through numerous dungeons and slay nasty monsters dwelling in them by shooting tears at them. Each dungeon floor has a boss at the end, which is randomly chosen from a batch of half a dozen of possible bosses for that dungeon area. After every 2 floors, the dungeon area changes and you meet new enemies. And of course all along you come across a massive variety of items and upgrades, some have a passive effect, like increasing your damage, others require to be activated, and some can even act as pets. With so many items to find, every new dungeon run is guaranteed to feel different.
Most of all I enjoyed the boss fights (from those I've faced so far). Each boss has a unique design, personality, and battle strategy, and I always get positively psyched every time I come across a boss room, wondering who is going to try and mash me into the floor this time.
The game has many unlockables, such as playable characters for example. You can even unlock new bosses to spawn in the game by meeting certain criteria, like by beating the basement level 25 times, or completing the game, and so on.
Unfortunately, just like most rogue-likes, this game is heavily dependent on luck - whether you find good stuff, what sort of enemies you come across, what is the design of the room you fight them in, and so on. You even find differently coloured pills as items frequently, and they always have a random effect, sometimes a harmful one. So that luck aspect of it can be a little annoying.
But in general this is one of those fun, "just one more try and then I'm done" games that's easy to jump into. I'd easily recommend it for fans of rogue-like dungeon crawlers.