Very nice game. Art is great, controls are good. And the game mechanic felt satisfying. When I got 5 planets and almost no fuel, it was so nice when I made it in time. Upgrades meant something and that is also great. Only one thing, the enemies. There was only one at start and I never encounter another one. So I restarted the game and didnt kill the first one. Then at least 6 spawned. For some reason all of them dissapierd after few seconds and I didnt see more after. 

Keep up the great work.
Also try my game:https://yahub.itch.io/last-three