Just a few bugs:
Game gives an error after each jump gate.
Modifying fire rate at the service dock seems to reduce fire rate (according to the ui)
Job hub will freeeze the game if you already have all 5 mission types active.
Otherwise I still would say that the reactor coil is a bit too overtuned, and certain upgrades should be removed from the upgrade pool after they are effectively capped.
Also the game becomes unbeatable if you die during later sector levels since every zone will spawn with 8 or more enemies.