I only finished 5 levels (I think), and the game's pretty enjoyable, that said I don't really get the central mechanic, why would I ever be on a timescale other than the slowest? I didn't see any obstacles which would be easier with a faster timescale, I guess if there was an incentive to complete the levels in a short time, it would make sense. The visuals are also very cool, but aren't very readable, there's some parts of levels where the darkness makes it really hard to see what's happening. The moving platforms also really mess with the player's movement speed, I always fell off because the instant I pressed a movement key the player went to lightspeed. Otherwise a nice platformer with interesting visuals.