Try 'Cheese in the Trap'. It shares similarities with 'Last Game' in terms of the complexity of relationships and the way the story unfolds.
I'd recommend 'True Beauty'. It has a similar charm in terms of character development and plot progression as 'Last Game'.
You might like 'Lookism'. Both have engaging storylines and interesting character dynamics similar to 'Last Game'. Also, the art styles are somewhat comparable.
I think 'Solo Leveling' could be similar. It has elements of survival and adventure like 'The Last Human'.
You might like 'Skip Beat!'. It has a similar focus on the main character's growth and the various relationships they form. The storylines have a touch of comedy and drama, similar to 'Last Game'.
Some similar manga could be 'My Dress-Up Darling' and 'Wotakoi: Love is Hard for Otaku' as they focus on relationships and have similar art styles.
I think 'Kimi ni Todoke' is somewhat similar. Both have heartwarming and innocent storylines.
You could try 'Kimi ni Todoke'. It shares some similar themes of relationships and character development as the ones you mentioned. Also, the art style is quite charming.
Well, 'The Gamer' is one. It has elements of strategy and fantasy like in a god game.
There are a few like 'The Gamer' and 'Solo Leveling' that share similar elements of adventure and strategy as Pyramid Game.
You might like 'Solo Leveling' as both have elements of characters facing challenges and evolving in a virtual or alternate world. Also, the action and adventure components are comparable.
The manhwa of Undertale is somewhat based on the game. It keeps key features but also incorporates changes to fit the visual narrative style of a manhwa. Some fans like these adaptations, while others prefer the original game untouched.