Tried again today, and on Chrome game started receiving inputs a couple minutes.
Game feels quite hard to control - you move to quickly, and not stop immediately after releasing a button. This together with punishing hitboxes and one-hit game over makes it too challenging.
A little more feedback after game over would also be appreciated. Instead of immediately cutting to main menu you could have a little animation of the player crashing. Or add some themed flavor text on “game over” screen, like those message boxes you use.