these are both intentional
1) fall damage should happen very rarely though (only on e1m1 or e4m3 - apart from that maybe some rare places)
but I see what you mean - the recovery was actually sped up because it felt too slow
2) I agree that this feels like a bug a bit .. but i'm not sure what to do about that 🤔 (many of my uhh.. 'innovations' feel like bugs 😔
(some of the encounters are designed as little logic puzzles - the shield comes very useful on the 3rd boss - even on Maxed
but as Abnessor mentioned - for the final boss it's not much use despite the inf. ammo )