At first the control scheme felt really difficult to get used to, and I never entirely got the hang of it, but as I started losing keys I quickly understood why they were the way they are.
I definitely like the art of it, and both the graphics and the music were very polished!
One minor thing I did encounter was that at one point, I was told I lost a key which I had already lost earlier. In a more complete game I imagine the game would avoid redundancies like this. I also felt like enemies were a bit too rare, and I often had to really go searching for one.
Overall though, definitely a very solid entry!