This would make a good idea, but Peter is already working on GC2. Also, post your ideas in the General discussion instead of making an entirely new thread.
I found some of the levels to be quite repetitive, actually. But I put this here instead of the general discussion to avoid spoilers. I hope you can understand that.
But, what if there was a challenge to build only one tower at all?
How about crafting a pylon using 4 gems with 32 amps?
Also, it would also take a load off of the developer(s) when it comes to developing levels. There is also the prospect of a player's pack.
Yes, the idea is basically ok, but not for labyrinth. This part has very few textures and tilesets (have you seen Chapter 0?). I'm sure Peter knows about this idea, and he'll add level editor to a part that will have numerous tiles, graphical features and multiplayer. Remember, adding this can be a big job too, and the developer is still doing his games alone.