Wow, that was hard
Levels 14+ we're hard, but rewarding. I finally beat all 25 levels and it gives you a nice sense of accomplishment. I think it was the perfect difficulty and took me atleast an hour. If you make another, don't dumb it down.
There's also a glitch in level 16(unsure, but it's the level on the picture near "play this game") where you move through one of the white triangle blocks making it impossible(I think).
To sum it up: very hard = good