Hello there. (...hmm general Kenobi ).
This is my first released game, hope that you'll spend some great time in it.
Short summary. You start with a low specs spaceship. In every match you have to collect some resources dropped from enemies to unlock new skills from the skilltree panel. The remain resources from every match are gathered in main menu, like the experience. This are required to unlock new spaceships with greater specs and attributes.
I'll provide you the link and some screenshots from game. Have fun!
https://void-alex.itch.io/hollow