Hey thanks for playing and the feedback.
Yes Jil is really annoying and talks over other people. Its just her insufferable personality. The jam was themed and two of the themes where "endless/infinity" and the other "Solitude". Part of my interpretation was to let her give you an "endless" tirade so you would rather be alone then in her company. I agree that this did not work out to well and will be one of the first things to be removed in a post jam version.
Illusion walls are actually quiet common in this genre and part of an exploration process. A dungeon crawler is usually a mix of combat, puzzle solving and exploration. And yes there is lots of room for improvement but if you only have 9 days (actually less then 6 in my case) you need to prioritize.