The pixel art is so freaking good. I kept playing just to look at it. The drill animation is also extremely good, and the 4-colour palette was used really well.
So far this is up there as one of my favorite entries I've played. I also love a good platformer, and this has a lot going for it. I really hope you keep working on it after the jam.
Also, the main character reminds me of a cross between a Big Daddy and an apple.