Star Wars-esque. Not an actual TD, but kinda-sorta
I like the fact that you don't get money from your kills for no reason like some TDs, but in this case it would make since.
It could use a salvage crew that actually goes to get the kill wreckage while being under attack, but you get ship supplies and mine ores instead of crystals in return or an addition: ores. (ships from crystals?) How about engine cores from crystals.
Needs minimal work. Definitely needs some music in the vain of Star Wars and updated sound effects. Good Job!