Yes, I saw your video! Sorry it all went a bit wonky for you; Unreal's physics can get a bit flaky at low framerates, so I'm not sure that I can do much about that, but the issue with the chair sinking into the road after a jump was something I was able to fix. So I did! I've uploaded a new version. At particularly low framerates you'll still see it sink in, but it will immediately pop out in the next frame, and you won't lose any speed anymore. There's also a new character, if you need an incentive to try it out again!