You actually can pull out the arrows with E, but only if they're within interaction range, which is a sphere slightly in front of you. When you crouch, it brings your body forwards, but the arrows don't always reach it.
I found the splash background colour option somewhere in the export popup while looking for an optimise button (There is no optimise button).
A linux build would be cool, but I don't have it on my pc. I'll give you my code if you want to try and make one. Or anyone else reading this I don't care.
Thanks for playing.!