So, my game uses the right arrow to go right and the spacebar to interact. I want a message to pop-up when the player presses the left arrow key that the charather has no time to waste and needs to go to the store. Can I add that? It's not connected with gameplay and it's not important for story (because the charather already said that "I have to go to the store fast")

Well, if one can play the game without missing anything by using just space and right, I guess you can do that =)

ok~