Thanks for playing and speedrunning :o the game :D
Yeah I definitely made the envelope hitbox pretty big (I kind of just made it the same size as the sprite without thinking about it too much) . And no healing is also probably also a big factor lol. The difficulty definitely should have been lowered or I should have given an option for the player to lower it themselves in settings. (also change keybinds in settings)
Your speedrun is amazing btw :O