Great work! Good art, a fun concept and a nice layout. The Timeline is always a good touch and the alternate dungeon turn/shift rolls for the creature are a good touch to keep players engaged in the central tension of the dungeon!
readability speaking the font is a bit small for an A5 page. The contrast between some of the colours used for box-outs and highlights might be a bit too similar to the background from an accessibility standpoint. The map is good, nice and clear. Stat blocks are nicely laid out, Some of the rooms are a bit information dense so the pages can be a bit overwhelming. Some images mixed in would probably counter the 'wall of text' feel a bit.