Ah yes, what you're referring to is 6DoF (6 degrees of freedom), similar to Elite Dangerous for instance.
I actually thought about it while developing the controls. However I figured that may be too advanced for some players, and decided to go with the more simplified 3DoF system, like No Man's Sky.
Regarding the sound effects, I only pulled a couple from freesound. Most of it was made with a triple oscillator, or just simple Audacity generators + effects.
I'm glad you found it fun, and appreciate seeing a 6DoF related control comment. For some people that style just feels right, for others it can take a long time to get accustomed to. Regardless, thank you for the feedback!