Gimmick was cool and some levels had really cool ideas. Although, some levels are cooler than others. Some levels were unintuitive though and felt more like bruteforce to get past. Other levels were very creative and make great use of the mechanics. My favorite levels were definitely the momentum ones. I think you could seriously make a fantastic, full-fledged game out of this mechanic if you polished up the physics and allowed for more movement. Great job for your first game!