Very nice pixel art! Sound is very good even tho it is like those old school NES games. Fits the theme very well. Bosses made me laugh really hard, especially the chicken and it eggs. Grappling mechanic is kinda wonky, yet still not too bad. Tutorial is not giant wall of text, so I had no problems with learning the game mechanics. For a game made in a week, it is not short at all. I like how after every boss it gives something unique to the rest of the game. Good job!
Also please play my game if you have time ;)