I actually quite liked this game, and I also really enjoy the metroidvania feel on the open areas. My biggest complaint is really the controls... I dislike WASD movement (with an extra button) for platformers. Using the arrow keys plus a jump and a switch button would feel a lot more natural, to me anyway.
I also kept having collision issues, mostly annoying when I'd fall through the floor into the lava. But other than that it was quite fun!
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Thanks for the feedback!
Maybe in my next project I will allow either multiple control schemes or even let the user define custom controls/hotkeys.
As far as the collision, I really have no idea what the problem is. I have begun working on an entirely different collision system, which should replace the old one (and hopefully its bugs along with it!)
Again, thanks for playing, and happy holidays!