• Color character customization will be coming soon. Skins and texture packs maybe later into the future, but we'll see.
• Results screen times sounds like a good idea.
• Saving times will come sometime in the future as well.
• Not sure about physics engine, but whenever I make the level editor, I am thinking about allowing the creator to change the values of the different parts and environment. Though I am still debating on this as it might be too much for the player. 
• Like/Dislike sounds good, but will come once I work on the backend.
• Not sure how to make the levels harder without making new levels, but I am open to suggestions.

I do plan on moving future updates of the game to just testers soon, if you are interested in being a tester, consider joining the discord, if you haven't already.

I made this game with Unity