The pixel art and backgrounds look great! I like the monochrome aesthetic. I don't feel like the music really matches the tone you're going for though. Some basic sound effects for shooting and enemies would go a long way.

The run and gun mechanics are simple but work. The camera is a bit disorienting when you turn around but fortunately the only direction to move is to the right. 

That first enemy charges right at you not giving you a lot of time to react. I noticed if you don't move at all it will keep pushing you to the left without doing any damage. The hit detection doesn't always seem to be working properly. There is also a lack of feedback of when you're getting hit and missing information like a life bar. A score counter might also be a nice addition to track how many enemies you slaughter on your mad dash to the right.

I did manage to mash my way to the end of the level in time. Nice work!

Whenever I try to install the game I get an error, which is a similar error to another game in this jam.

I already found the error I did not add that folder, there will be no way to edit it