I'd turn up deceleration a bit since it's hard to get through some doors, I think due to decelerating too slowly.
I think I'd have the enemies start path finding only after they see you. I think there was one behind a door that was trying to get me before I opened the door.
A target reticule might have been nice to make it easier to tell where your aiming. It sometimes felt like it wasn't quite right at the mouse due to the 2.5d.
I can't believe how polished you got your game. It's really incredible. Integrating the tutorial into the game in such a natural way and also picking a very natural control scheme were good moves. It made it really intuitive to pick up and play and seemed to be something that a lot of other games really struggled with.
A web version seems like it might have been worth it. Given that you built it in Godot, I wouldn't have thought that would be much extra work.