Stopped being fun by the final level. None of the platforms move in a predictable enough pattern to make progress possible at a reasonable rate. The enemy placement also makes the very indie mistake of assuming that choking the player with obstacles makes for a reasonable challenge. Its incredibly frustrating to start making progress finally, only to end up back at the bottom in a few seconds because of one mistimed jump or getting constantly hit by enemies.
This has the makings of a nice fun and tense puzzle platformer, so its kind of a shame that it went for a few levels with very forced difficulty instead of fleshing things out better.