Thanks for the feedback!
I made all of the sound effects myself using Waveform 11 free, and this was my first time with sound design.
The music I got from itch.io. I credited them in the game description if you are interested. I forgot the first guy's name, but the in game music is by Dos88 and he has a ton of awesome stuff if you are interested.
And you're not the only one that has taken issue with flying out of bounds. I think I am just going to make it a wall instead of a kill barrier. I'll see about adding an indicator icon.