Really nice presentation. Art and music are really top-notch.
I was able to play just by myself. I was confused at the start, was not really sure, what to do, what each of the things in the level does, but after a few tries, I think I got it and it was easier to just avoid them and not really try to use them with the mechanic.
I noticed in one comment below, you've prepared 6 waves but because of a bug, they didn't work, which is a real shame because right now it is really short. But I'll look forward to your new version of the game after the voting ends :)
Really good job! Kudos for making a multiplayer :)