Clever idea! I like the police attacking from the sides and, at first, I thought not being able to backspace was a problem, but I was also going to argue that it's easy to just type in a command and wait for the barrier to arrive to press enter - when I played hard mode, I realized that not allowing backspace punishes players for trying to abuse this tactic, so I realized that that limitation was clever. This game certainly has potential. Good job!