Super cute idea! I love cats so I HAD to play this one! I appreciated the pixel art of the cat - that was super good - and animated!
I noticed a bug where if I got a power pellet before my first one expired, it didn't extend the length of my spaceship, so it's like I never picked it up and the one I just tried picking up would still be gone - so I ran out of power pellets and got stuck on my first playthrough.
A few things I would like to see:
1) More SFX - make it sound / feel good to play - there is potential here!
2) Possibly my preference, but if I had to start running from a bad yarn ball, it was hard to find a time to turn and shoot without taking damage, so maybe strafe / shoot any direction would be good to add
3) When flying, you constantly fall, which make shooting only in one line also hard to control at times, making the limit of how you shoot harder than it probably should have been for me
Otherwise, great game! Good job on this one!