Wow, that was an innovative puzzle mechanic! I really liked this one. I think you did tutorials very well and the game greatly benefited from it. The simple mechanic had depth enough for you to teach advanced techniques as the levels go on and even though it's a game jam, you pumped out so many levels! It has all the elements that compose a great game design, well done! If I would point out something negative, it would be some difficulty spikes across a few specific levels. On them, it doesn't feel like solving a puzzle, it feels more like tinkering with milimetric position changes or experimentation until you randomly stumble across a solution. The nature of gravitational physics means a very small change on the starting conditions might result on completely different outcomes, and this becomes very apparent when you feel lost on this game. I guess it's the curse of innovating, you'll never perfect your creation when you're the first to do it. But well done anyway, one of the best puzzle games of this jam. Solid 5 stars on innovation for you. Great job!