Ahhhh i really liked this idea - reminded me a lot of Reassembly - and the upgrade system being tied to the WASD modules was really cool! Also holy heck the sound design on that boss fight laser was so good.
Some things i'd love to see would be a way to move/remove pieces youve placed - I may have accidentally placed thrusters in the wrong direction and beat the boss fight by spinning around wildly near them :P
Also to that vein maybe also the pieces visually rotating when you rotate them in build mode to prevent confusion! But this is mainly a me issue ahaha
Really solid idea, could see it being developed in ways and has a cool premise with the shipbuilding!
W Meowstcritikal