Most of the tower descriptions weren't populated, so I wasn't sure what each tower did at first.
I think sorting the tower list by price would make it easier to use. A tile-based placement system might also help, as I ended up stacking five towers in the same spot. I also found that pressing the start wave button multiple times sent me straight to the end screen.
Money became quite easy to earn, and once I had a tower with a large area of effect, it felt a bit too strong since the shots damaged everything they hit. 5 wizards in the ring and a garlic just outside it.
The art wasn't always consistent, but that's understandable with the time limits of a game jam.
Overall, something I would be proud of, Great Job!