Whenever you use the red balls to reverse momentum, you can just jump and then save your falling momentum. Then convert the falling momentum into jumping momentum, and save the falling momentum from THAT fall. Then convrt THAT to jumping momentum, and so on. You can keep jumping higher and higher.
I found a real bug. In the very first level, and probably at other parts after it, if you put down your detonaters and win, then drag the black one onto the field, the you win message comes up a second time. You can't go to the next level unless you do level select, and then the message stays until you pick the next level, at which point you can click it to skip the the next level. For example, I skipped to three without beating two.
The purple feed should actually be worth 15x the normal feed, not 5x. OTherwise you lose ten coins on every buy, so you just have to take much longer to buy 15 normal feeds for the best deal.:(
There should be something to reset the room when you fall. Otherwise you can't expect anyone to ever finish this game. I also recommend not make spacebar jumps so floaty.
A nice, fun little game. The World 1 music is hard not to love, but the block-stacking is slow and frustrating, and goes from able-to-be-skipped (Thank you, bouncy blocks) to why-do-I-need-so-many!? in the last level. I recommend working with the blocks themselves less and more with the challenge being manuevering the actual marble.
My main complaint is with the half-hearted use of the gamepad. I can move around and run and jump, but can't move the stair without using the keyboard??
I think I found an Easter egg: When playing with the XBox 360 controller, hitting Y will change her outfit into a demon-similar thing. It looks like an evil version of her. It doesn't seem to have any effect on the gameplay, but since it isn't listed in the controls and I don't see a button that does this on the keyboard, it seems odd.