did u put your pixel art to Filter mode: Point (no filter), because your pixel art was very blurry.
The movement was pretty hard. I don't really see why u put "shot" on the mouse. The way your shoot mechanic works it makes more sense to put it on a key. Idk why u didnt put the jump button on the w key.
The jump was also way too fast, felt like i had little control over how i moved. U could lower gravity when going up, and increase gravity when going down. It would give a bit more control.
Other than that, it was a pretty classic game. I liked it.