Add some enemies and fix the controls. Either change them to WASD or make them user-configurable. Also, fix the physics engine. You can't jump while walking up a slope.
Yes, because all shotguns can't hit the side of a barn after 5 meters and 44 magnum requires you to wait 30 seconds in between shots so that you don't accidentally shoot yourself in the face.
@Jiminy::
Yeah, I should spend hundreds of dollars on a guitar and lessons and take 3 years to get sorta good instead of playing a video game. Do you even play guitar?