It's a cool game! A couple potential improvements:
1) Provide a "level selector" or way to replay already-played levels 2) Provide a way to restart current level 3) Explain the scoring more fully
Thanks!
1) Gotta think how to do this, since the levels are randomly generated. Perhaps go with the custom seed like they do in some games...
2) Great suggestion, gonna do it soon.
3) Added "full rules" section to the intro screen.