how did you even get the leather cape? it's not available in that hack xD
anyway, you just continue your way up the marble gallery, then go to the Library and buy the Gravity Boots, then you can get the Soul of Wolf...and after that there are many other pathways that's become available to you.
Sorry for late reply I just saw your message now 
(also make sure to patch it with vanilla SotN so it wont break some things..there are some wrong tiles in your screenshot so im thinking maybe it that's why you're stuck)
