A very interesting game! Unfortunately I encountered a lot of bugs that haven't been discussed in any of the previous comments and much of my play time was spent wrestling with those.
Is there a known issue where audio will refuse to play regardless of settings? I can't get any sound or music for some reason. I did see some kind of funky Avast prompt the first time it loaded (aside from the regular Windows Defender prompt which I am used to) and wasn't sure if that was related, but closing and re-launching didn't help.
On the topic of how the game launches, it was weird that it opened in full-screen initially but I couldn't see the mouse cursor anywhere on-screen, even though Windows had complete focus on the game client and wouldn't let me click into background processes. I suspect it could be a game engine limitation but I think it would be better to have a windowed mode option.
I ran into one issue where a tutorial dialog tried to run exactly when I clicked something in the home area, so I was stuck in a menu with no way to advance the dialog (left / right click did nothing). Eventually I hit Escape and it took me out of the menu, allowing the dialog to run.
I ran into a problem with an Encounter in which the Bookshelf wouldn't seem to do anything regardless of which skill/outcome I selected. There was a Taunt prompt I believe, which flew by pretty quickly and didn't really help me get past it. I had to exit the area which ended that run, unfortunately.
I'm not sure I like that when only one enemy remains, offensive skills are a single click with no need to use the cursor. I get that it's faster, but it's not consistent and takes some getting used to. it also doesn't mention this in the tutorial unless I missed something.
It seems like you can start with 3 party members, but some of the other creatures are actually unlockable if you go into one of the Upgrade menus, then upon returning to the hiring area you can recruit up to 4. This was super confusing and I don't know if this is how it was intended to work.
I loved the art style. Animations felt punchy even with no sound. Fantastic, amazing sprite work.
It seemed like enemies ramped up in power way faster than players. Are we supposed to clear all 3 areas in a horizontal row before moving to the next row? I think the world navigation could use a bit more explanation or visual cues to have at least some idea what we're doing.
The ideas behind the upgrades, skill customization, etc. all seem very cool but I didn't get far enough to experience much of it due to the various UI and technical issues. There's a ton of potential here and I do plan to retry in the future. I hope this feedback is helpful!