OK, I'm done.
I played & finished 2 more times and I beat my score each time. Game 2 I got a 2844 & game 3 I got a 2863.
Game 2 I only let 1 guy get through (missed 1 guy), and in game 3 I didn't let anything get through.
There are only 35 levels, not 36. Here's a screenshot of the end of level 35:
You still can click on "next level" for some reason, and clicking on that is what gives you this:
Just to give you an idea how hard it gets, the HP (hit points) that it takes to kill one object on the last level is 30,000.