I know from experience that tower defense games are hard to make for jams, so good job.
It was fun to try and figure out the optimal strategy, though the game was a bit hard at first. I'm not a huge fan of enemies detracting coins when you run into them, but it's really cool how the mouse moves around with WASD and has to go around obstacles. The towers are neat, but 2 and 3 seem like the only ones that are super good. But all-in-all I had a lot of fun playing it!