Here are my second sets of an ideas you can customize your cars and add better engines or buy a new one like a jeep or tank maybe an add better mob drops like stronger monsters better loot and maybe a custom mode where you can do anything and edit everything like place turrets monsters things like that
My idea for the game Boats so you can travel to new islands and Shops And Towns that you can buy that you get income that you collect you can find one orrr you could build one and npc's will spawn in it and you should add animals and like a food system fishing maybe? npc fights? Castle Sieges? Defences from an invasion from monsters? a skill tree? a Class Tree? And Maybe Custom Swords and armor
Could you add mixed jobs like a Alchemist could be a cleric and a wizard together
and a knight and cleric could be a paladin or even better Adventure + archer = Theif
 "Theory of Magic"){kind=icon}
 "Wartune"){kind=icon}
 "Island Escape beta"){kind=icon}
 "Rotatix"){kind=icon}
 "The Grinns Tale"){kind=icon}
 "Lose the Heat 3"){kind=icon}
 "Seedling"){kind=icon}
 "Innkeeper"){kind=icon}
 "Dungeon Inquisitor"){kind=icon}
 "Monster Breeding"){kind=icon}
 "GeoSketch"){kind=icon}