I like this one a lot, good job. Level design is very clever and gameplay feels natural; artwork is simple but cool, music is nice (maybe a little repetitive on the long run but it's totally ok) and I love them little details like highlighting the names of the levels you've already played or the shake when you hit a wall (watch out for the grey background when that happens but again, minor flaw).
Also, wp for the volume options in the menù, even if I noticed it clips when you change it, but I wouldn't know how to fix that.
Lastly, I'd put a simple CRT/Noisy shader on it, since it already has that old-style vibe.
I'm being very critical only because this game is one of the ones I've enjoyed the most, and I think it's really good — seriously, well done.