This is another platformer using light as a mechanic to change the state of the level.
The collectibles found in each level will only evaluate as collected after you return to ground. There is also a greedy uncollectible object which will always get you killed.
White ghosts bounce you, red ghosts kill you. Ghosts only appear while it's dark.
Wall sections are capable of moving depending on the light state, but they are abandoned in favor of ghosts as the game progresses.
It's a simple and competently made game. Shoot higher, and come back in January!