It's really great to see that people liked it. Thanks for all the nice comments.
We are thinking of working on a post-competition version of the game some time in the future (with sounds/music and some bug fixes, possibly new features), so if you have anything you'd like to see in the game, please say so.
seregrail7: About the physics, we chose not to be too strict on being retro. We started off with "retro" in mind, but about 1/4th of the way, we realized that making something more retro would limit us in ways we didn't want, especially when demaking a game that is so physics oriented, so we decided to relax on "retro" and focus on fun. It's still a 3d-to-2d demake, though.
Please keep the feedback coming, especially if it's helpful for a future version.