My apologies, I implemented some code to try and prevent that type of problem but apparently it wasn't thorough enough. I'll try to implement a fix for this in future versions.
For now, you can reset your controls by going to your local appdata folder, then the Crisis_Point_Extinction folder in there, and deleting the keys.ini file. If you don't know how to access your local appdata folder, simply press the Win+R keys to open a Run prompt, type %localappdata% in the box that appears, and hit enter, then find the Crisis_Point_Extinction folder.
Thank you for bringing this bug to my attention!
Viewing post in Permanent keys?
Ah shoot, sorry - I completely forgot that this demo actually saves files in the Crisis_Point_2019_Public_Demo folder within local appdata, rather than the Crisis_Point_Extinction folder. You just need to go to that folder instead and delete the keys.ini file in there, then reboot the game, that'll set all the controls back to default!