This page explains our final version (219 bytes). We initially worked alone but then exchanged ideas and tricks, so erling & mathewsb deserve most of the credits!
our code was originally 226 bytes, but "Cosmologicon" pointed out a way to save three whole bytes, bringing us to 223 bytes.
With p01, we then came up with a way to save another 11 bytes (making the game 212 bytes). He also suggested keeping track of score, which takes 9 bytes but is totally worth it!
skrounge found a way to save 2 more bytes, brining the game to 219 bytes.