I really loved this submission! I played like for half an hour (which is a lot for a jam submission, I think hah).
I think you may even have a great prototype for a commercial game with this :)
Some feedback/suggestions:
1) My first combat was a mess because I didn't understand how to fight haha. Maybe you should hold the enemy first attack for the first combat.
2) The arrows on the combat mode should be more eye catching (like using a yellow arrow and a pulse animation)
3) [I'm not sure about this one] Items from loot should have a description. It's hard to understand what they do. But there're games (like The Binding of Isaac) that work great without giving you a full description of the item. So maybe you could work in some kind of categories for them (like on Isaac) so the player knows that the item is a combat ability, an ally, etc. Edit: I just saw on a screenshot that there are descriptions! Again, maybe you could create a color code to group them and make it easy to understand what they should do on a glimpse.
4) You could add a small transition to fight, to make the player aware of it.
5) I saw two weird things on the combat mode: the fight music starts quite later and the fight options doesn't appear exactly when your bar reaches the 100%
But in general: congrats! This is a great game, keep working on it!