Technically A Game

I mean when you get down to the specifics, what is a game? Well it's a thing you play. And usually they have a genre. This game has one, I think.

Move around levels and shoot things, pickup different stuff to move around levels and shoot things better.

There's also a variety of things to do while moving around levels and shooting things, and there's different ways to shoot things as well.

This game really has all the stuff that makes a game a game. But is it one? That's up to you to decide.