The graphics and audio are nice. The concept is interesting, but I admit that gameplay was pretty frustrating. Although, after playing I noticed that it was partly due to user error; I didn't notice that the keys' current directions were visible on the screen. Hence, I played the game a second time with more attention to the keys' icons, but the gameplay was still more frustrating than fun since the changing directions kept messing with my own sense of direction.
As for improvements, I'd say that the keys' icons could have used some kind of a visual effect to draw the player's attention to them so it would've been harder to miss and/or ignore them. I think their positioning is good, but it was easy to ignore them as soon as you started playing the game. Unfortunately, I don't know how to improve the movement mechanic in its current form, so I can't give any constructive criticism for it.
Nevertheless, I think this is an alright first game. My first one was so bad that my partner and I named it "Brain explosion" simply because the platforming was so awful that it felt like our brains would explode when we tried to get through it (which I think we never did). It didn't even look good or, if I recall correctly, have any audio to make it any more pleasing to the eyes or the ears, so you did far, far better than I did back in the day!