Double-posting because those bugs are losing.
Anyway, in version 4a, you'll be able to get a maximum of
150 HP (unless I slipped up),
200 mana for the Acidic Bubble spell (unless I made a mess of things), and
50 ammo for Arcadia (if I didn't ruin it)
OR, under a very specific condition, infinite ammo.
All the outfits can be obtained, a spoilery NPC has been added to several cutscenes (they prefer to be silent though), a mermaid is finally important-ish (I kept forgetting about her until recently), a bad ending has been added (ha ha ha ha ha), and the Confusion Zone is confirmed to be in version 5.
Also several bugs have been fixed unless I failed at that.
(My cheerfulness is a façade by the way. I worry a
lot about Lily and others.)