I'd love to see you explore this game more! The presentation is nice and clean, and I like how the map is randomized each time! You've got great sounds for each action as well.
I think the first thing you should add is some kind of explanation on what makes each tower different. I assume the second one is shooting two bullets, and the last one may deal more damage because it's slower.
This looks like it may be your first game jam submission, great job and keep it up!