Nerf spamming, I just spammed the two lowest towers and won every level because the DPT (Damage Per unit Time) is too favored towards basic ($30 for 18 DPT (3 dmg x 6 spd)) compared to the heavy ($100 for 24 DPT (8 dmg x 3 spd)) and to some extent the light ($60 for 20 DPT (1dmg x 20 spd)). Even Helen Keller can see and hear the best deal here, and the recharge time of 5 seconds vs. 10 seconds certainly doesn't help (in fact it somehow doubles the problem). Otherwise a very visually pleasing and smooth 40 minute experience. Keep working on it, it's got potential :)
Thanks so much for playing, and taking the time to leave feedback and suggestions! I'll admit the balance is way off... since this was made for a game jam I didn't end up getting to play test as much as I would have liked at the time.
I may come back and work on this in the future, and I'll definitely use the info you've collected to help adjust the experience. Thanks again!