It's funny that we had a similar idea, but with different genres :) It's a bit overwhelming that you have so many options at the start of the game with a lot of text. An unlock system might be nice, but thats probably to much for a game jam game ^^ It's nice that you have quite a lot of variety for foundations, towers and enemies.
I really like the visual indicator for the stats.
All in all I had fun playing it. Great job :)