Took me a couple of rounds to understand the game, but then I got to the end I think, because I couldn't see enemies spawning anymore on the map. But then suddenly my crystal got destroyed by the invisible enemy I guess. There was a lot of good in the game and a really impressive amount of stuff done for the few days that this jam was, but I think the invisible enemy really came out of nowhere and didn't benefit the game. The crystal got destroyed so fast. The arena should have probably been smaller in size as well, because running around felt quite slow. The towers and gold didn't really have much purpose either.
Admittedly I did play solo, so it would have probably been more fun with friends. Good job!