All the art/music/sound effects are great. I've always liked the aesthetic of low color-count games, especially ones like this that still manage to keep everything important on screen clear and distinct. The idea of traversing each level once, then stomping back through it in your mech destroying everything is a really fun one too.
I do think the game is a bit unclear on what exactly to do in the beginning (Although I appreciate how all the information is conveyed in a way that makes sense in the context of the game, cool touch). I ended up walking to the end of the level, where I thought I was stuck until I wandered back to the ship and my character repaired it. Maybe having the first level be extremely small, like one room, and forcing the player to go through a full loop of gathering resources, fixing the ship, and leaving all at once would help with this initial confusion. Or maybe force the player to do a small bit of repairs before they can continue on.
Overall, great job!