Levelling up, and the hook platforming bits were the best parts. I wasn't particularly fond of the character, and found them to be a bit offputting. The tone and writing just makes it come off pretty negatively and made it difficult for me to connect with the main character. I also found it a little difficult at first to figure out where I was supposed to go as I went back to the previous stages a few time by accident.
I stopped right around the level with tons of spikes and the mushroom enemy. One hit kill mechanics and punishing results from a missed jump rapidly sap out the fun and that was the breaking point for me. The level design in general feels like a lot of jumping around on random platforms and I think it could be tweaked a bit to give a bit more overall direction.
I did enjoy the enemy design and their animations when injured.