It seems like you made this dungeon for D&D 5e, given the monsters and DCs, in which case you should probably make that clear so your audience knows how to run it. I also like to put page references to where creatures can found in the core books so it is easier to GM. I also question inculding the philanges room (RT4) given that you yourself call it boring. It might be more interesting if someone/something was trapped inside so they would have a motivation to try and get them out.
I do like how fleashy all the description are, very fitting for the dungeon crawl inside of a monster!