That's reeeally strange, from what device/browser are you playing?
i am on firefox
exactly what happened is i open the game, it works normally but when i enter level select my mouse starts moving uncontrollably(not just the in game mouse) and i cant click the game most of the time. i only got into a level once and it was level 4. its really difficult to close the tab
EDIT:i forgot to mention this i am on an old lenovo laptop.cant find build. os is manjaro linux