So I just tried to play it again doing what you recommended and got the game to work.
First off, the camera is way too close to the player model when you are in the city area and I cant control the camera with my mouse.
Since this is a twin stick shooter, maybe make the right or left stick control the camera rotation. (assuming there's no enemies in the city to fight)
Also, the enter key is an awkward key to use when you need to perform actions in the game. I would probably use F or E so its easier for the user to pick things up or open doors without having to move their hands.
Once I got inside a building I killed one of the baddies with a health bar over their head and they dropped some spinning colorful thing. Once I tried to pick it up, the game crashed.
Overall, I'd say the game needs a lot of work but I can see see what you are going for and I think it has potential.