Thanks for the feedback! Setting up the fake 3D stuff in Gamemaker took longer than I would have liked, but I think it paid off in end. I appreciate that you like my art-style!
I agree with your critiques, the game certainly has some issues with communicating to the player. -- I think a free dummy timer/delay troop might have been a more elegant/self-explanitory solution to letting players split up waves (assuming I also coupled that with better communication of the abilities).
Thanks again!