Very nice.
Holy crap! This game is harder than it first appears, and way more fun than it should be. (Just one more try... I know I can get it this time!)
Wow... Level 3 was EEEEEVVVIL--and that's a good thing.
Only two minor gripes:
1) A few more passwords would be nice, say every 5 levels... it's kind of discouraging to screw up to realize you have to go through all of it all over again. Or perhaps a retry button. Ah well, it's quick enough. :)
2) The Main button and the failed (Japanese? Chinese?) text look kinda clunky. Everything else is fine though.
*Very* nice work!