This is good fun and plays really nicely, however I think it needs to be a little more lenient when it comes to accepting inputs as occasionally that was frustrating. Another big thing is that, if you are going to specifically tell the player that should be trying again to get all the endings, then make that possible in the game. It was very annoying to get an ending and then have to refresh the page to start again instead of getting 'ending 2, press R to restart' or whatever.
I also killed all the cops, got all the coins and exited. Then I got the "Don't let him get away" and nothing happened. I tried pressing space and the arrows but nothing so I was left being unsure if I'd found an ending or if the game had bugged out which was unsatisfying. It would be nice if we could be told "ending number 1" or something so that it's clear we managed to do something