Seems like it might have been a little too ambitious for the time frame? The lack of description on what anything does, how much they cost, and where to place them made the game a bit hard to understand, and while I did eventually sort of get a handle on the way the game worked, once the wave starts you reach an impasse since the soldiers seem invincible. The lack of music or sound effects is also a pretty glaring omission. I think this is all stuff you can work out with more time.