I like the movement of characters and how they look. They look hilarious! And the constant shaking when holding fits all of this soooo well.
Weapon and tools are very creative. I was like "hmmm a sword, a gun, a double grappling hook!? A pen platform?!?". (Little bit of exaggeration, but rest is really what my mind is thinking lol)
Controls are kinda hard to use, but after a bit it is not unmanageable.
Color schemes are already nice, but I think the color of the bullet is kind of hard to see.
The screen effect is pretty neat and fits well with the game track.