You can get fuel by investigating ? events over asteroids or by selling mech parts with right click in the hangar.
NICE! Now my mecha is the strongest in the whole Solar System!! Controls are a little bit unusual.. Punches could do some minimal damage for showing player that the game works actually :) And sounds, with sounds the game would be so nice. BGM is awesome! But battle sfx are mostly absent :( Anyway I had fun. All these special attacks animations are great!