Hey,
Thank you very much :)
I'll keep it short and adress only the issues, because about other things we can just talk on discord.
VR is starting for no reason with UE games if you have VR drivers installed EVEN THOUGH I unchecked "VR" in engine, the issue is known and well, nothing much I can do about it I guess then hope it won't occur. The inverted controls might have occured because of this too.
As for the controls I didn't have time to include button mapping or different set of controls so I sticked with 2 most popular ones which are WSAD on keyboard and Analog stick for Gamepad. But now that you said it I think mouse control could've been better.