Hey thanks for the feedback! I'll take a look at the double jump not working; that's kinda important for reaching the other two bosses. For everything else I'm not too worried as I don't plan on continuing the project and just wanted to publish what I had finished.
As for the first (tutorial) boss, you can't beat him, but if you get him low enough you'll trigger the cutscene that way. And yes original plan for the game was to have three towers for different mythologies, Norse, Egyptian, and Greek. But it was way too large for me to complete alone lol