I like the concept, but The grapple hook is too fun for you to want to actually fight the enemies, and I feel like if it were more combat based than it would be better, maybe you need you kill the enemies to advance, also because swinging and movement is the name of the game here, I feel ammo isn't needed. I would love to see this re imagined as a arena shooter, where you grapple around in the asteroids, killing waves of enemies.