Yea the dungeon was supposed to explore to find multiple keys and open different doors to reach the boss or find multiple keys to open multiple doors, but didn't manage to make it fully work so it became more of a try to find the key.
For the battle i think the main fix i could do is either try to see how to add more time so the action buttons don't apear to fast or add a animation so they slide down after a while when dialog is gone
For the run button, i did want it to if flee you would have teleported outside but didn't have time XD (had to scrap other enemy battles)
I did not consider that the door would permalock if flee and key grabbed tho
For movement i did follow a basic tutorial, and honestly would have liked to add more movement other than basic wasd
For the crash for space i didnt crash in my testing but for mouse its not a crash but i think an oversite of the pause screen, cuz its always there but hidden (i had someone play it and that happened and i didnt put 2:2 together)