REALLY enjoyed the mechanic of this. The game even locked up and I rebooted to keep playing.
Would dig this as a mobile app with randomly generated levels (would also work if you did it with sliding tiles w/numbers on them instead of hats, though the rats/hats/bats was very cute)
Only one issue: hard to tell exactly who has more hats when it's very close. A few times I lost a level because I didn't realize they had one more than me.