OMG i don't know where to start... This game is quite bad.
The story is dumb, this is not a real point bc we honestly don't care for the jam (as for spelling and gammar...) but I need to say it.
The visuals are awful, I gess it was fun for you to draw them in MS paint and I will give you a pass for this. (why the McDonald's logo tho?)
The real problem for me comes from the game itself : this is boring! As you can only shoot and reload, the game is a no brainer : just fire all your bullets and hope for the best. In the current state, you can simplify the gameplay to "spam SPACE and R" and this is too bad.
You should have spent more time on designing mecanics : make the moving part useful (dodge bullets, gather ammos etc...) and add some other things to do.
Last and final nail in the coffin : I don't think it sticks to the theme. If your interpretation of "only one" is a fighting game bc you need to be the last one standing, then games like Street Fighter are good too, even if you can choose between ~40 caracters... And what about Battle royale games...
I hope i wasn't too harsh, I tried not to. Still good job !