Fun gameplay!
I managed to reach door 19 and thought I was doing really good only to see that I got C/D, realizing that I suffer from a severe case of skill issue ;-;
I liked the music. The graphics made it a bit hard to see and I would recommend changing the color of the instructions text to black as yellow on blue is hard to read. Other than that, it'd be nice if the player was always spawned facing towards the door, that way they don't get disoriented and can just go full speed all the time :D