The game felt extremely laggy, however, the browser and 3D games don't mix too well, especially on a weaker system. You mention how disappointed you are with the final project, but for me the purpose of a game jam is to try out new ideas / software with heavy time restraints. So with that being said, both building a 3D game for the first time while using a new game engine is impressive enough on it's own. Don't beat yourself up too much and keep at it.