Solid game but I don't get the theme?

Really fun, maybe the entry I've spent the most time on so far. However I have some pointers.

It doesn't feel like the speed upgrade actually does anything. You feel slow even when you put a lot of points in it.

No ending? At some point the shop stopped coming, and I just shot away for 8 minutes until I ran out of ammo. Ended at 500k points though.

I believe you don't take Pythagoras into account when setting the velocity of the ship? That makes it so you move faster by always moving diagonal, which feels bad as you feel slow for just moving on one axis.

The theme is really vague here. I get that you gather resources by killing the enemies. It's fine, but a bit weak in terms of the theme.

Music and graphic was fine.
Enjoyed playing it. With a bit of polishing I would love playing it more.

I quite liked it but I never had enough money for bullets and spend a lot of time just running away with nothing to do. Other than that though I had a lot of fun