Fly script for a part thats connected to HumanoidRootPart

Imagine if you joined the game your friend has been talking abt recently, and you don’t see your character but a part, and the point of the game is being a flying part and kill flying parts

Ok, but we dont need any npcs or smth
So how do i make a fly script for a part?

I tried using fly scripts from toolbox but some of them are using a tool or just making you fly (until you press a key)

But I want a flying script that makes you fly even if you pressed a key (it just makes you float without any speed, just float)

The part is connected to a HumanoidRootPart, but I will change that after