This is extremely well made, how did you make a complete game with story and boss fight in ten days?? x_x
The characters are charming, the pixel art sprites look great and the movement is fluid and fun.
The only nitpicks I have are:
-The enemies are a bit bullet spongy, it feels weird to have to shoot a basic enemy like 10 times to kill him, and most of the time you're just waiting there while shooting, making the fight not much more interesting than if it was a one-hit-kill.
-The gameplay overall is kinda simple, jumping and dashing behind the enemies before shooting them worked 100% of the times for me. Something that switches things up was missing, I was never really that engaged during the gameplay bits, even though the movement is great and the overall look of the game gorgeous (I was very engaged during the VN parts tho^^)
But these are critcisms on a very high level, for a Game made in ten days this is really outstanding. I would love to hear more of Johnny Slick and his posse of lovers? friends? sidekicks? situationships? whatever they are, they are very entertaining!