I liked playing this game! I appreciated that the controls were somewhat intuitive: the ship would fly forward/backward based on my mouse cursor, which is much easier to control than controlling left/right thrusters or something.
I didn't realize the going into the enemies would lower my hp until I died the first time. I suggest having some sort of visual or audio indicator would be good. I eventually realized I had a hp bar at the top right and it was decreasing, but by then it was too late for my first playthrough.
I played a second round and did better! I encountered and maybe killed the first boss. I feel like given enough rounds, I would get a better hang of the controls and play much better. I went to the upgrades screen and appreciated how many things there were to upgrade, even though I didn't get far enough to purchase any.
From the end screen, it appears that there are other weapons too, but I didn't experience them in my short playthroughs.. lots of content, which is great!
Another thing I really appreciated was the music after I died. The game itself was quiet which fit the space setting, and when I died, the ending theme was both celebratory and sad, if that makes sense.. and it fit it well!