Incredible audio, graphics, and strong NES vibes throughout! It did take me a few seconds to realize that I was moving in the beginning of the game (there weren't any planets visible on my first run), so maybe consider changing the sprite to show when the ship is accelerating or ensure at least one of the planets spawns in a visible location, as it looked like I was just spinning in the dark for a little while at first. I'd be curious how your game would play differently if I could level up my speed in addition to the other stats—more often than not, my health just kept getting whittled down due to just not being able to get out of the way in time when trying to sneak in an attack or not having enough speed to outrun an incoming enemy.