It looks like you probably did a lot of intricate work on systems behind the scenes (with hero classes and whatnot), but I couldn't really tell what those systems were doing. Some sort of animation to reflect the things that change in the game would go a long way toward making this easier to understand.

Regardless, nice work on finishing and submitting in time!

Nice game, from the beginning a little less understandable but it's probably because I'm stupid. It's a game with great potential and I think you did it well.

Quick to play and cute characters.

As an improvement, i would suggest to add some feed hit/effect feedback. For example, i couldn't understand at the beginning why my towers stopped shooting, as nothing apparently happens when they get disabled by the rogue.