Sad ending, fun game!
Too bad about the bugs, but I managed to win without cheating. I am not sure if this is intended, but you can teleport into another block if the blue portal is on the same tile. And then you can move out of the block on any empty side. I won the second to last level using this technique.
Some levels really forced me to think a lot. Too bad there is no music.
I would also have liked a rewind feature, so i don't need to restart the level from the begining every time.
And a faster walk speed would be nice!