A silly idea for a cooking game.
It's a low-poly, low-texture 3D first person game. You're a private chef tasked with making a variety of meals for your clients in their fancy mansion. Only you don't have any of the right ingredients, and your only tools are a blender, a knife, and a series of jello molds. This isn't your usual restaurant sim.
The player plays with the tools and discovers how they work. Most items in the world are physics objects you can drag around and bring into your kitchen. The knife chops objects apart. The jello molds are in the shape of whatever you're trying to cook. But most importantly, the blender accepts anything chopped small enough to fit into it, turns it into a liquid, and that liquid fits in the jello mold. The catch is that whatever color of liquid you've created has to match the color of the desired dish.
So let's say you need to create a roasted eggplant - you need to make purple. There's nothing purple in the kitchen. Instead you find a red slab of beef. So you go out into the mansion and find a blue ceramic vase. It's the right color and sure enough the knife cuts through it. Both go into the blender and it averages the colors. That can make purple. Except, under the hood the blender is not only mixing colors (based on averaging out hex codes), it's paying attention to the volume of the objects you're putting into it. So the twenty pounds of beef you've put in plus a narrow vase makes a kind of purplish red. Not eggplant at all. But maybe if you ran back out into the mansion and found something indigo or even black you could balance it out.
Silly idea but could be fun in multiplayer. Make it so the mansion is full of stuff but things take forever to respawn if they do at all, so half the challenge is hunting for the right objects to efficiently make all the recipes. Add in time limits, upgrades like being able to store your leftover mixes, more complicated recipes that need lots of different colors, whatever seems fun. Maybe eventually you unlock an axe that lets you chop up the walls for extra ingredients (or maybe even your clients...or your fellow chefs).