Even with speed upgrades, the ship feels slow. I would add that moving the ship around isn't too satisfying. It lacks something like thrusters, or some control to make it move at different speeds maybe.
I don't feel like a pilot flying a spacecraft.
Possible improvements
Increase the base speed
Increase the rotational speed
Add a visual effect for the thrusters
Add a button to go much faster, at the cost of a greatly reduced rotational speed, (and possibly consuming endurance?). This could use an activation effect, e.g. a heatwave shader?
Even with speed upgrades, the ship feels slow. I would add that moving the ship around isn't too satisfying. It lacks something like thrusters, or some control to make it move at different speeds maybe.
I don't feel like a pilot flying a spacecraft.
Possible improvements