Really fun game, managed to beat the 20 waves and a big boss. If you'd develop the game further I'd suggest some small visual tweaks / hints:
1. It took me a little bit to realize that you actually have to click the drop power-ups (but maybe its just me)]
2. I'd suggest tweaking the visuals of the hit counters, right now they are quickly becoming a little bit overwhelming visually?
3.Maybe you could add some basic info of each tower to the shop, also I didn't realize that I can power-up towers by clicking and upgrading them until like 10 wave (but maybe that's just my lack of experience with a TD game and otherwise it's a known pattern).
OFC I get that this is a jam entry and we had limited time so all of the above points are meant to be suggestions for a further development.
Overall really solid entry and a fun game, good job 💪