Shift and Shift 2

Shift

Remember Nitromes YinYang? Here's a similar idea. Trapped in a two colored space (research facility?) you have to find your way through each increasingly treacherous level by jumping and more important shifting your color as well as gravity. If you're black, you can only move in the white zones and vice versa.

Shift 2

And while we're at it, heres the sequel, appropriately named Shift 2.