I just realized that this website existed again so I made something out of it. I decided to make a sort of platformer test world. I tried to make the physics similar to IWBTG and the sort. Still gotta figure out how to make yourself jump higher the longer you press space, lol. Feel Free to use this for any of your projects. Not gonna lie though, it's definitely spaghetti code.
A/D or Right arrow/Left arrow moves you horizontally. Space makes you jump. --Water-- W/S or Up arrow/Down arrow moves you vertically.