Pretty cool!
The jumping mechanics have been done before, as Animamundi24 says, but these are implemented quite well, and the platform then feels pretty solid.
I got to the boss battle and tried a few times, but I'm currently demotivated by failing parts of this that I had previously got through successfully. :)
The music is a bit loud and I had to turn the volume down a bit. I do like the music that it transitions to in the boss battle though.
I was 'caught out' by a dialog choice, and liked that idea.
There are some spelling mistakes in the dialogues, though, that I think should be pretty easy to fix.