The visuals and ambience are on-point: empty and lonely, like space.
The item score system is interesting. On subsequent runs, I found it was harder to avoid the extra items than it was to get them all!
I appreciate the speed setting :)
I understood enemy behavior #1 (same direction), but enemy behavior #2 seemed a bit sporadic; couldn't quite get the hang of it.
All in all, good work!
Enemies have a state that is simpler to understand and control and another where they refuse to be commanded but cannot prevent the player from doing so. It is possible to study this behavior, which makes it easier to pass the levels, but it is not mandatory and the player will depend a little on luck. I think it feels like I'm dealing with an alien mind and that's what I tried to reproduce in the game.
