Yeah, I noticed that about the wall jump when I was playing it. I figured I'd keep it in there as a cheat if people needed to observe for the game jam. I honestly was too lazy to fix it.
The water gun was meant as an optional weapon. It was about pros and cons of the weapons - the yo-yo doesn't need ammo but it takes two hits, and the water gun is powerful but needs "ammo".
Thanks though, I'm glad you liked it!