This was quite possibly the most stressful yet most fun game I played for the jam.
I did notice a small bug and a small exploit. It seems zombies are immune when under water, which I thought was a really good idea; however, once I reached about wave 6 some zombies could be hit under water, some couldn't, it seemed random. It also seems that you can just stand in front of two of the jars (jars, vats?) and just hold RMB to keep rebuilding directly in front of you and keep shooting, makes it almost impossible to lose. When playing the game without using the exploit though, it is EXTREMELY fun, and a little overwhelming, but not enough to take it from the fun.
Really enjoyed the game, thank you for sharing!