I liked the combined mechanics from the different games all being used together. The last level was a little frustrating to me but the quick respawn time and the limited number of elements you had to string together in a row kept me playing. I thought the controls were a little loose. The two levels with the backwards L portals and the last one in particular required jumps that I don't think should have been difficult, but I had a lot of trouble getting the player to move in the way that I wanted. Maybe a little more acceleration? Just a small nitpick though. Very nice overall!
Music was nice and relaxing too. Just got out of the way and let you play. Well chosen.