I thought it was pretty perfect for a kind of small-scale test dungeon. Only real gripe is that yeah - it ends juuuust when the puzzles were really starting to get good. The early ones you just kind of no-brain threw the orb around until things fell into place, but as it went on you had to think a little more about the order in which you warped with things; it was a really solid progression of difficulty, I'd say. The prospect of a room becoming unwinnable if you perhaps wasted all the warp points sounds a little tacky, but I suppose there isn't too much you can do about that. And yeah the player can just leave and come back in.
Also sounded pretty decent and looked great; I love the kind of satisfying gradual camera movement you have going on (those screen transitions are niiiice). KEEP IT UP!