

Its native resolution is 800x600 and my desktop is 1920x1280, so the game was only using the upper left quadrant while the rest of the screen stayed black. Easy workaround: changed desktop resolution to 800x600 so it utilized the full screen.
Could only use alt-tab after selecting "full screen" inside the game's settings menu, after which it popped out to it's own window.
It required a user ID and security key at launch. After some research, I learned this is in the game's "install.vdf" file (home/.steam/steam/steamapps/[Game File]/); which can be opened with a text editor and the keys were where the [ ]'s are here:
"###SET#PROPERTY_USERID#[ ]#SET#PROPERTY_GAMELICENSE#[ ]"
Alternatively, you must contact the company and wait for them to send the keys.
Everything seems to be working as far as I can tell. I didn't notice any problems except the fullscreen not working properly.
I had to play in windowed mode.