I wanted to program it so that you die when your a block away from the purple square because there is basically no way to escape, but I just never did it because I kind of though there might be a way to escape and I had other things to worry about.
At some point it just becomes impossible to remove everything. Which i supposed is the point, if its just an arcade game. The only other issue I had is my mouse cursor would i guess move off of the game and the guy would be stuck going in one direction.
Honestly I have no idea what you are going for but it almost feels like a horror game because its of the inevitability of it all. Just mute the music as it goes add a little heartbeat for the anxiety.