Missed two red coins somewhere and I have no clue about where. Item memory issues, maybe? That, or I missed something really obscure in the sewers. I remembered seeing a red coin guy just out of bounds near the hidden clouds.
Really like the new countdown timer sound in the third room. It's a lot more distinct and it works a lot better than the old one. Pacing was a lot better too, though the drain rate might be slightly too slow. Not really sure; I don't want this level to become basically impossible to 100%.
Sluggy fight was fun, really liked how you increased the stakes with such simple changes. That said, it looks really funny when Sluggy moves over a bottomless pit.
Maybe use spikes or something?
Also while I'm at it I'd recommend maybe using a different BG3 background.
Sewer felt messy and probably too easy. I'd recommend either increasing the risk of the water (making it easier to fall into, or encouraging the player to wade/trudge through it; i.e. for collectibles, dodging an enemy setup, you could set up some interesting risk/reward stuff) or redesigning it to be a linear segment like the other two, but with both the toxic water and fog. Also a lot of weird cutoff and palette shenanigans going on.
This platform ghost being so far beneath the water looks really strange.