Thank you for playing! Yeah, I'd intended to add a lot more game to this game but I underestimated how long it would take me to make the basic mechanics work and ran out of time. I totally agree with you re: new gun types--I want to keep working on this after the jam, and I'm thinking you may be able to trade shrooms for better/different gear in between levels. Shotguns, bombs, what have you.
Also I just played your game, it was lovely and very impressive. And it was cool to see what you did with the same tileset. ;)