Hey! I really liked playing your game. The visuals are nostalgic, the music is relaxing, and the slider and collision sound effects make the game more satisfying. Also, the popup when you forget to set the velocity is a nice touch.
The idea of changing the physics variables begs for someone to break the game, and I mean it in a good way :) It really feels like a relaxing sandbox with a few levels to test your understanding of the environment.
Overall, this game has great vibes and a cool mechanic. Nice job!