I love this! I really like the concept. I really like a multiplayer version of this (obviously not for the GameJam: D). The first time I didn't read the rules properly and basically never shrunk down to the smaller battlefields but on my second round I tried to deal as much damage as possible. It would also be quite fun if you could shrink down again in the smaller battlefields, but that might get too confusing at some point :D Good job!