This game is actually quite similar in concept to the one we made, though we went in a different direction. I've seen a number of games play with this concept and this is the first I've seen to introduce different kinds of platforms with different behaviours, and having the height variation matter is a great touch too. I do however think the bugs with the interface detract a little bit from the experience, and the falling platforms "fall" out of the level after you switch back to build mode rather than staying where you placed them before you switched to play mode. Overall a good game!