Thanks for checking it out! Yeah, I think you're right in that implementing mouse aiming would have made it easier and probably a bit more fun for players for sure. I did have a bit of inspiration from Tron with the ship model and level design actually! If I decide to update the game and flesh it out more, I am going to see about adding some Tron-like glow to some parts of the ship and including some glowing engine trail.
As for healing, you'll need to pause ('P') and then select, 'retreat.' And when you are back at base, selecting the 'Merchant' option will spend your funds/score to replenish your health. I'll look into making that clearer too.
Thank you so much for the feedback!