i love this a LOT. it's a simple enhancement that really makes the game's environments shine more.
i think some levels with a sunny skybox having a faint green tint instead of a bright yellow or blue tint is a bit odd, but it still feels nice. i feel like a light yellow/blue would help in making it feel sunny. would probably require some screwing around with to figure out what feels better.
i think inside the castle could benefit from a warm tint, giving the feeling that it's lit up by candles or lights from the ceiling. kind of a nice, warm feeling to compliment the homey castle theme!
i like the yellow tint on levels like whomp's fortress and the wing cap stage, but i do think it would fit more on stages that have a sunset kind of feel. it doesn't really match with the skybox too well.
maybe on the secret slide stage, an orange-ish tint would work? since the lights on the walls are orange and whatnot.
the tint for snow levels is REALLY nice, though it has the effect of dimming the trees. it could be brightened a tad, but it does make the level feel really cold!! it also has the side effect of making the cabins feel really dark...
i definitely feel like my favorites are the water levels and the lava one. they REALLY do well in adding to the atmosphere.
