Hue
Hue is a platformer whose gimmick is selecting a color from a wheel that changes the background and causes the corresponding color in the foreground to disappear. Remove walls, falling rocks, and balloons as you navigate your way from place to place unlocking new sections of the color wheel.
The gameplay strikes a nice balance between platforming and action, but some creative choices left me with more subdued opinion of the title. There are long stretches of corridors where you won't find any hazards or puzzles. This might have been added to lengthen the rather short experience.
There's also some sections that require backtracking if you go the wrong way, but the moody soundtrack helps relax the senses so that it never feels frustrating. Pick up Hue if it goes on sale or just get the soundtrack by Alkis Livathinos.