Pretty much like L4D, but with distinct objectives, unlockables, and teamplay is of higher importance. You can unlock equipment which benefits the whole team, and before starting each mission, it's important that everyone gets equipment which works nicely together. It's worth what they're asking, and if they add more missions, it'll be a happy purchase imo.

the basic idea is cool, but they didnt go any further than just the basic idea. The art is bad. Please be aware that when I say the art is bad I don't mean the graphics are poor. I mean even considering the limitations, the developers could have produced much more thoughtful art which played the strengths and weaknesses of their engine. The art production seems completely lacking in finesse. There's potential here, but it certainly hasn't been realised yet. I hope the funds they make from this game will let them do something more like what they originally intended for their next project. I still want to try co-op though.

It's kind of like if double dragon was an fps, and it was set in some universe which is so fucking outlandishly weird that it manages to make sense in it's own way. The fighting mechanics are quite unique and they feel intuitive but without sacrificing options. I haven't been as impressed by a melee fighting system since Mount and Blade tbh. The story is whacky and entertaining too. Be warned that most the gameplay is brawling against opponents. There's some shooting segments and a part which plays almost like a tower defence kind of thing without towers, but in my opinion the brawling mechanics are good enough to justify the game being mostly just that - brawling.
Even if you don't find it completely enjoyable, it's just too weird and unique of a game not to play through to see what it's like.