Truck-kun strikes again!
I had fun with this short platformer. I always appreciate an in-game tutorial, great choice. The variety of mechanics was nice. Throwing the rocks initially just seemed like a puzzle-solving moment, but then they made a good weapon in the next room! The wall grapple was a good idea too!
The art was all cute and worked well. I especially liked the portrait. The story didn't go too far, but I have an idea of where it's headed. Truck-kun got a chuckle out of me, especially it's return later. XD
The controls were a little tough at times... too slippery on narrow platforms, and the wall grapple was a bit hard to use. Shot angling was nice, but again, could be a little hit-or-miss.
If you plan to keep working on this, I'd say polish the control-feel a little more and it'll really shine. Overall, great work!