Excellent map! Tickled by the set up with the dungeon being run by a lich rather than being inhabited by it.
Tons of potential here, but it needs some work. There's a lot of blank space in here which could be used to further flesh out the adventure after some reformatting. From what I've noted of other submissions, lots of "system-agnostic" modules have rough encounter descriptions for GMs to work with adapting and balancing to their system of choice, whereas system-specific modules have each encounter properly stated up. There's an awkward middle ground here with a specific system and some stats, but the rest left to DIY.
If you decide to update this after the review period I'd suggest leaning into the system-agnostic vibes or fully 5e, which will help determine what to fill the blank space with. Would love to see it if you do! There's some fun ideas here I'd enjoy seeing more of.