I loved the idea and execution overall!
The ship building feels satisfying and the controls feel really unique and functional.
The music works really well and the art looks really good!
In terms of feedback:
I think, while the ship building is really cool, it can be a bit annoying to have to build a ship at the start of every run since it can take a while. Maybe it would be cool to have the option to run with that same ship or build a new one, although I understand that might cause people to not engage with the ship building or just try to get the most "optimal" layout.
In my first run it seems like I built below what is actually permitted? I had secondary thrusters one level down from my main one, and I got stuck and couldn't even take off lol!
The lateral stabilizers felt a bit too jumpy for me in the context of the game. They work kind of like a dash but I think it would feel a bit better if they worked more like your other thrusters but for your sides. I feel like that would leverage the familiarity the player builds with the thruster controls to have a more "reliable" component.
Great entry, keep up the good work!