The description in your first post reminded me of Shift and VVVVVV. http://en.wikipedia.org/wiki/Vvvvvv
VVVVVV gameplay video.
[spoiler][/spoiler]
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.
[spoiler][/spoiler]
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?