gave this another go!
can definitely say it's way better on a controller. unfortunately I ran into another bug. if you get past the golden key door and grab the next iron/dark key, don't go back towards/through the gold key door, you will fall into nothingness and be left on a blank salmon/pink screen.
I think that's it for my attempts, interesting game and I'd recommend checking it out, but be wary of bugs :)