The description in your first post reminded me of Shift and VVVVVV. http://en.wikipedia.org/wiki/Vvvvvv
VVVVVV gameplay video.
In VVVVVV you can't jump though, you just switch the gravity between up and down. It's been well received, so you might be onto a winner.
I look forward to hearing more.
EDIT: Thinking about it, it sounds like your game could be fun to speedrun. Have you thought of adding a timer to each level that saves a high score of quickest times?
VVVVVV gameplay video.
In VVVVVV you can't jump though, you just switch the gravity between up and down. It's been well received, so you might be onto a winner.
![[+]](images/collapse_collapsed.png "[+]")
SpoilerI look forward to hearing more.
EDIT: Thinking about it, it sounds like your game could be fun to speedrun. Have you thought of adding a timer to each level that saves a high score of quickest times?