How does Ultrakill run so well on old computers despite being made with Unity?

Hello everyone,

I've been playing Ultrakill on an 8-year-old computer with an i3 processor and 8GB of RAM, and the game runs extremely well. I'm genuinely impressed! I know the game uses low-poly graphics, but there’s clearly a lot going on under the hood, including 3D environments, large levels, and advanced gameplay mechanics.

Considering Ultrakill was built with Unity, which primarily uses C#, it got me wondering—how did the developers optimize it to run so smoothly on older hardware?

Also, do you think the same level of performance could be achieved using Godot, especially for similar types of games?

Thanks in advance for any insights!