The closest thing I can think of is “I was reborn as his highness the prince’s evil little dragon” not tower climbing but still pretty close to HTSAAP
https://www.mangago.me/read-manga/kiss_the_abyss/
It's shounen ai and it's ongoing. I just accepted it ended and stopped reading after the first "tower" ending. It's a game world the MC made but afterwards it's other worlds but I just stopped cause I already felt the closure lol.
"How to raise a victim"
It's not tower climbing but it's VR fantasy game
Does anyone have any recs for an action tower climbing manga that still has BL like “How to survive as a player”??? It was so good but author is on hiatus and I need AIR HELP CANT BREATH BLEH