Fair enough X)
We added a controls section in our description :
"Move left and right with the arrow keys, once you're close to a passenger, use the spacebar to open their interaction menu. From then on you can use the A / E to check their documents, and use the V or R keys to either let them stay on the train, or eject people whose documents don't match.
Each correct decision adds to you score, so be fast, be right and get those numbers up"