Great groundwork for something great. Really enjoyed it
What you've done so far is a massive achievement.
Not sure if you wanted some feedback, but I have notes of a few things that stuck out to me. Mainly a lot of the game _feel_ is kinda flat.
Interaction feedback, and juice - a lot of things don't feel very impactful. For instance the player's seconds ability [#3], the wind up feels slow and the tail end of it feels short and uneventful.
Picking up health items doesn't feel like anything is happening.
Some enemy attacks could use more telegraphing.
Does the sword attack have any variations? Probably all of these could use more animation _steps_ (things happening in a staggered fashion gives more impact) and additional particle effects.
The levels could use a little something more. Maybe addition set dressings. and things to break or pick up? Actually I think would they really need is to imply a larger world. Like a skybox that hints to the tree tops of a wide forest. Or an inaccessible side of the caves opening to a wide inaccessible cavern or underground lake.