My suggestion will be about pirate game's (game engine: unreal engine 5 or unreal engine 6 if its out)
I will first start with sea of thieves II
same gameplay as sea of thieves but more realistic graphics (still cartoon looking)
New pirate game fully realistic(quixel megascans for full realisme)
Gameplay(for both)
Mix of sea of thieves & skull of bones gameplay: (you will have your own ship with your crew(non player one) you will have same open world aventure as sea of thieves but ship/battle play is mix of both. what i mean by that is you have option to use both you use cannon your zelf (sea of thieves way) and bots crew help you or like (skull of bone or world of warship) you also able to make alliance with your friend to have max 4 ships in your alliance to rule the sea
Sword fighting:
more dynamique with more option cutlas. katana. Sword... more mele weapons
Ship customisation :
Like starfield you will be able to fully customisation with real ship parts inspired (and crossover the pirate of carabine or one piece)
Hardware: xbox series and pc or next gen if its out and pc
And better server to have multiple players (50 player. 50 ships atleast)
Extra:
More sea creature and land monsters
Sandbox mode to have your own server to pve with your friend ship as alliance
