This game is, unfortunately very buggy. A giant buglist fills half the screen when you start, and has to be manually closed. Some enemies can't die. Your weapon changes randomly (this might be intentional). I killed a boss thing and all the sprites went solid black, and half of them disappeared. There's also no stated goal or story other than shooting enemies. Which is okay I guess but not really that fun in this style of game.
Plus, the biggest problem is that this doesn't really relate to the jam. The weapon changing is probably a "dice roll", but it doesn't feel like it. I can't even be sure that was what the intended relationship was, because I only even saw 4 guns, and that's a pretty small "dice" if that's what it was intended to be.