Not bad, a lot of work went into it already. But...
It feels slow paced and thus gets boring:
Doesn't give a sense of control over ship evolution, enemies feel as threatening as sea urchins. Pickups usually cannot be reached in time to be picked up.
Needs a dose of action:
Enemies need a flight & attack strategy, rather than waiting for you to drag the base into their sights. Needs to give a visible sense of the difference between ships (what shots are powerful, faster, what they do... same with ship, which is stronger, faster, what are the trade-offs)
Ship maneuvering is cluncky:
Diagonal movement & shooting is possible, but fleeting. Need to change to a different control system, like acceleration/rotation, or follow guide point, rather than up left right down. As is, you basically have to park on your target to hit it... no fun maneuvering for an attack run.