>>> The skill tree is unlocked from the beginning. Not sure this was meant from the beginning of your planning for the game?
If you look at mid game game video below, when you leveled up you earned a new skill point where you can decide of the next skill to add (although the selection is rather limited). However, most people that tested the game did not even play long enough to earn skill points so I just added all skills from the start.
However, I do have a working skill tree component that I now can use in other games and this game.
>>> Maybe I just never figured out the general tactics there.The Fire Shield spell is your go to DPS spell, but I did a poor job highlighting that. The hints section on the main itch.io page says it but I guess it is not enough.
>>> I would like the controls to be a bit more fluent and responsive. I used QE a few times by mistake when i tried to turn around.
I wanted to have all the keys in one area of the keyboard (WASD for move/turn), QE for potion/interact, and 12345 for spells. This proved to be a bad choice as many people use different keyboard layouts and also have the same issue you experienced. I think after the jam upload blackout I will just use an on-screen GUI for controls.
I appreciate your feedback, it was constructive.