Flip: Done
I decided to go with another puzzle game. Designing puzzle mechanics is always fun to do. :)Designing levels was quite tricky and I didn't allocate a lot of time to it. Hopefully the levels I made should give a feel for the puzzle mechanic. The puzzle has some interesting properties, but I'm not sure if it is possible to go much deeper with the mechanics as implemented; or at least, creating deeper levels is not straightforward. The synchronization aspect of the puzzle is a bit tricky to handle from a level design standpoint.
I hope you enjoy it!