That's a problem on my part then. Great to hear that controller support is already included! I guess I was initially confused by the "Keyboard only" text in the controls menu, though I now know what you mean.
I played through the demo with the updated difficulty, and actually managed to finish it this time! The difficulty is a lot better now, though far from perfect. I still think game overs lead to much more frustration than they should. Losing all of your money is a big pain, and other things such as unfolded ladders resetting is also a questionable design choice in my opinion.
I liked the weapon variety , abilities and bosses. Though I've gotta say that the game doesn't feel much like a Metroidvania. It was quite linear safe for a few keys, and also very combat focused. That's not necessarily a problem, it just wasn't what i was expecting. Generally I'll also say that keys are a quite boring way of locking off certain parts of the world, and that more ability focused locks would be preferable.
I discovered a few bugs during this playthrough, but that is to be expected, and it was nothing game breaking.
Little things like the tutorial birds and the dancing shopkeeper definitely put a smile on my face. You are clearly passionate about the project, and it shows! Keep up the good work. Looking forward to more!