That was fun! I like the atmosphere between the visuals and music. Cool! Some nice bits of polish, particularly the SFX I thought.
Had the same issue w/ Firefox, Chrome worked the second time I loaded it.
I think the biggest thing for me was it was hard to tell that your ship was moving since the background mostly looked the same, I could see some faint "clouds" if I looked closely. But it made the game feel a lot more static than I felt like it should.