Thanks to you! :)
Hmm.. You are on the right track. There should be something new to keep player motivated. Different monsters maybe? Or power up objects that make monsters flee. Like in Pac man for example. Maybe rests? The music stops for a while and neighbors return to their home. But after a short period the music continues and they become mad again. And you could make a boss. It is always fun to have a boss in every game.
I tried the game again and yes there is an explosion when someone hits you. That actually looks like fireworks to me. Maybe that's why I did not recognize that I was hit. :)
Maybe you could inform the player a few seconds after that the tape has ended? Then there would still be a reward for being sharp but it would not impact so much if you forget it while making the neighbors happy.