Just finished the game :D Took my 3 tries, and my winning run was 14:28 minutes. It's really good, thanks for making it! The only negative thing gameplay-wise is that the first time I played I didn't realize I wasn't moving forward, I kept destroying the incoming enemies thinking the game was that, until I realized I had to advance to the big ship. The visuals are amazing, although the fast moving background was a bit too intense for my eyes.
Thanks for the bug reports, albertvaka! I uploaded a new version that addresses the issues you mentioned as well as others other people have found. Give it a try and let me know if it works better for you (the less-intense background is in the pause menu).