BossHim's ERROR 404 (Phase 1) - [No Shield 12/15] (Possible Limit)
27BossHim's ERROR 404 played without using the Shield, an intended mechanic that makes the game easier to play.
This is the best run you can get without using it, the bone and orb barrage is too crowded to dodge, and even if you make it to the part where the bones unavoidably hit you, you can only make it like a second or two past where I failed before you lose all of your HP, nowhere near enough to complete it.
It's a shame because this is the only attack that isn't possible without shield, I've tested the other ones and they're all possible, except for this one. That being said, I don't recommend trying it unless you can somehow find a way to beat it, which... that would be funny.
If you want to try, knock yourself out:
https://gamejolt.com/games/Err404-bh/887957
(Just be aware of how much unavoidable damage there is and optimise your heals.)