Thank you for playing and for your feedback. We will take a look at the softlock, that was definitely not intended to happen. I am wondering though how you are able to get there without the double jump.
Idk how I did it, but I did it after a few tries cause I remember trying for 15 minutes to get out but I couldn't. The next playthrough I found the blue orb and THEN went to the key and getting out was super easy that time.