Visuals are decent and very consistent. Music and sounds are nice however the feedback isn't clear when I take damage, I only really know when I look at my health bar. Since the ship upgrades are within the play area, it lead to a couple of unintentional purchases.
And lastly, the game is far too easy. Score attack games must be difficult because the player must feel like they did the best they could before a game over, but in this case it took so long to game over that I just gave up and accepted my score: 
Repairs increase in price the more you use it which is smart, but that's really the only way the game becomes harder overtime. I never had to use the shield, and as soon as I had two drones gathering fuel I never had to worry about it. More so, having a third to defend me really made it easy to get an infinite run. In my opinion the drones should also increase in price the more are purchased overall.
In the end, the fixes it needs is just a matter of altering some values and testing for more rewarding gameplay, everything else was done well.