Just worst stick fight
It has a whole bunch of different weapons that are cool to mess around with, but the basic gameplay means only some of the guns can actually be used strategically (namely the portal gun). The weapons are fun to use though, no matter how broken some of them are. I wouldn't call this a good game, but I've had a bit of fun playing it with friends, so it's not totally a bad one either.

If you look past the fact that this was made by PETA (easier said than done), it's actually not a terrible game, especially for it being free. The art style is... okay, I guess, the story is pretty bad, but the gameplay is decent. There's a good variety of weapons, which are basic but "good enough". I think the main issue is the repetitiveness of the rooms and quests. It wasn't that big of an problem for me since I used this as a sort-of filler multiplayer game, but I can see this being an issue otherwise.

If you don't own the Binding of Issac and are willing to deal with PETA propaganda, this makes an okay multiplayer game.

me when Viper boss fight 😔

Very fun party game every once in a while; the longer you play, the more repetitive it gets. The online is also generally dead, likely due to the lack of updates. With the mobile version not even working anymore, I recommend playing on console if anything.

I had a bit of fun with this game when it first came out, but charging $10 was pretty scummy (especially since there weren't many courses, which are already shortened enough). The different modes were cool though, but not enough to warrant the price.

Short but fun 1-hour game. The music and art are good - very similar to Cave Story of course - but there wasn't anything that interesting story or character wise. The controls were sometimes annoying, but the dash makes up for it. Overall, it's a nice little experience that will probably be enjoyable for Cave Story fans.