Really neat mechanic, I might be stealing it in future! Soundtrack is very cool, although it kinda breaks when i switch tabs but it is probably just unity issue.
I can't win though... From my calculations the expected losses are the same when you spread over 1-3 cells, so things that matter are a) maximising passed challenges and b) whether it is a good idea to not use some dice (i guess not, because you lose money you paid for them while crab gains more damage). Any tips? :)