You can't add a timer to your game and expect someone NOT to speedrun it.
In all seriousness though, this game is really well made. The level design is smart, it isn't a walk in the park (minus the first 2 levels) but it also isn't a Nevada mail man's worst nightmare. The controls also feel very nice and smooth and the characters and animations are cute. The humor in this game is also nice. I like the idea that mail is some sort of unstoppable force that can destroy concrete walls and kill aliens with a single hit lol.
I did encounter a strange bug, however. For whatever reason if you go back to the main menu while in a level, the entire game has a stroke trying to figure out what level it's in. It's hard to explain so I'll just send a video here. (Don't mind the mistake I made at the start pls, it never happened)