Very interesting concept of trade-offs, exceptional 3D and 2D art, and great soundtrack, which differentiates this from the jam's popular "fight the towers" idea.
I feel like some of the time it's a bit difficult to know what something does, but the how to play screen clears some things up. Maybe it was just me, but I couldn't get the shop upgrade menu working, and I sometimes didn't know what health the towers had. Would have also maybe liked to see some more terrain?
Props to your team of six! Solid potential for a really great game.