It's a simple Platformer Game about collect the Gems to active the platformer ( If you collect a Blue gem, the blue Platform will active ), Yellow, Pink. And you need to avoid the Ghosts... if they hit you they will take your Gem, and the Gem color is back to the color of the ghost.
And there are 2 Modes:
1- Play: it's just playing among the ghost and try to collect the gems to win.
2- Endless Mode: it's about trying to always go with the camera to the Up and try to not go down.

And there is a simple tutorial to make the rules become clear.

THAT IS IT.
MAYBE Easy Peasy Lemon Squeezy (: