This is so wonderful. I may have hit a bug at the end, but I'm actually headed /right back/ to play it through a second time!! Excellent Undertale vibe.
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when I pressed Z to replay after i got the descend ending, it took me to one of the final corridors approaching the final boss and the avatar sprite kind of dashed left and was flickering like a ghost. sorry i didnt capture video or anything but i had to refresh the browser page. it never reproduced