Interesting concept! Unfortunately the web build crops much of the view, so I found it unplayable. The windows build works better, and I managed to jump over to the top of the tower to the left, but then couldn't figure out how to progress further.
I see, I appreciate that! Perhaps adding a clear sign that it's the end of the game for now would make it clearer. I felt like I had to abandon it rather than that I had completed it.