Overall a really good game! The pixel art work is really good and does well with the limited selection of colors. The music is an absolute bop and I would probably listen to it outside the game while doing work.
The bullets though are way too small. They're almost impossible to see especially with similar sized objects(the stars) that look basically the same moving with them in the background. The player movement is also very rigid. The ship seems to teleport more to locations rather than move to them. This is especially jarring since the stars in the background are much smoother leading to two different movement styles.