i only played 1-1 because i wasn't completely sure the game would work (not gonna elaborate cause it was wrong)
but anyway
it was fun, took two tries to get all three coins
you are awesome for enabling pre-completion saving

underground sounds kinda depressed but maybe that's just me

two errors(?) i noticed:
on the title screen the settings button acts kinda weird, not sure how best to explain it
coin signs are still star rather than ztar

final note: soundtrack release?