Hey everyone!
I think I've settled on my idea so I can hopefully start working soon. I'm thinking you start out as an abandoned asteroid mining robot trying to find its way in space. Upgrading from scrap equipment and power sources as you explore your asteroid belt. You'll probably have to manage your size and equipment depending on your power source size, maybe some drilling through asteroids and climbing.
It's going to be a 2D side-view adventure game. I'm just using libgdx and MS Paint / Adobe Photoshop.