Why did you put green and red (orange) in the wrong order? It's bad enough that the human mind can't reasonably react to the colors of each wave of balls in time.
Do you think you can lower the requirement for three stars by juuuuust a bit? Right now, the only way you can reasonably get that score is by playing through it immediately after you clear it, which isn't very fun.
I'd like to know what different effects the explosives have before I buy them. Also, the amount that ore scatters is absolutely ludicrous, and the fact that it will often bounce into the trees where I can never hope to get at them frustrates me to no end. It certainly doesn't help that there's no magnet upgrade (as far as I can tell).
Apparently Bagel Cat belongs to Erwin Schrodinger, because I killed him on one level, died two checkpoints later, and when I respawned he came back to life and made it home. (And before the pedants get on my case, yes, I know that's not how the Schrodinger's Cat thought experiment works.)
It's a lot like other puzzle-platformer games I've played, only the controls are slippier, and your second runner can't affect the first runner in any way. The Company of Myself and ChronoTron, among others, already did this sort of thing, and did it better.
Why do people always complain about the hotwire? I always get past that part in one go. Did you try holding up and left simultaneously on the last part?
Level 20 is confusing, but I figured it out eventually. The "stonehenge" should be standing of its own accord, i.e. without any cursors holding in place, when the ball rolls over it.
 "Indestruct2Tank"){kind=icon}
 "Teddys Excellent Adventure"){kind=icon}
 "Warbears"){kind=icon}
 "RGB Gotta Catch Me"){kind=icon}
 "Canabalt"){kind=icon}
 "Talesworth Adventure: The Lost Artifacts"){kind=icon}
 "Amigo Pancho 2: New York party"){kind=icon}
 "Boom Town"){kind=icon}
 "Bread Duck"){kind=icon}
 "The Ice Temple"){kind=icon}
 "Sichiken"){kind=icon}
 "My Life is Yours"){kind=icon}
 "Prizma Puzzle Challenges"){kind=icon}
 "The I of It"){kind=icon}
 "Innkeeper"){kind=icon}
 "Battle Beavers"){kind=icon}
 "Fancy Pants Adventure: World 3"){kind=icon}
 "NoNoSparks: Genesis"){kind=icon}
 "Pigs Will Fly"){kind=icon}
;) ... even after playing the game a hundred times, I can still laugh about that one myself