Thank you for playing and for this insightful feedback! <3
I wish I had made the movement less slower from the beginning, now that I have 4 levels each having ~5 enemy-behaviors it's hard to reprogram all those enemies so as to be balanced with a faster/slower player. I'll definitely look into it though, maybe increasing speed a little won't introduce any issues.
Controller support is on my to-do list, didn't get around implementing it for this demo. But it's definitely a must!
I'm afraid I'm not hoping to add fullscreen support since the window's content has to be scaled roundly to preserve that retro look.
Though I'll make sure to provide an option menu from where you can resize the game's window ( for the demo you can press F1/2/3/4/ to change the resolution)
Thanks again for playing! Make sure to stick around while I'm finishing the game :D