5 STARS dude good work ;P
on my constellation (Safari 9, Latest flash 19.0...., OS X yosemite) the achievements that appear at the end of the level (level 5, 10, 15, 20) freeze the game. You can still click on the Menu button to return to the menu and then continue on the next level, so it's not that bad.
Music is nice, gets a little repetitive. If you're going to loop it then cut a plausible loop, so you don't have to here the fade out and the beginning again and again.
Nice chilling game. I like the pastel (I hope they are pastel, so I didn't just embarass myself) colours - my eyes don't hurt. The gameplay is nice and enjoyable. I would personally prefer medal system, instead of achievements, though.