As co-creator: This game is hard.
Even though I helped to make this game, I must say it's still pretty hard. In a lot of the sections you need to plan out your moves in advance if you want to get past, and the lack of checkpoints in some areas (my bad, lol) mean that failing puts you back at the beginning of the level. The most frustrating element of the game, in my opinion, is the reverse tiles, which can cause you to screw up even a carefully planned maneuver. Other than that, the game was a good challenge.
Only thing is, it's kinda short. If a sequel is made to this, I'd like it to have more levels. Other than that, a challenging if short game.