Hey, really nice game!
I loved the dialog at the beginning that instantly gives life to the characters. The facts that levels/puzzles change seamlessy made the game very pleasant to play. The swap animation was really satisfying. The puzzles were well put together, maybe just a little too easy. The personality of the rock + it's hat + the music gave me a good laugh.
Rock-on-legs character sometimes got stuck in walls, but I had no other issue.
Impressive for a first game, congratz !