For me performance is poor, it's unplayable. To run the game, I had to turn on Chrome's enable-unsafe-webgpu setting.

For me it worked fine - even on an iPhone running Safari

It's odd, it worked flawlessly on a M2 Macbook air running Firefox. I usually have to switch to Chrome for anything fancier than just browsing.

On Ubuntu WebGPU and Vulkan was disabled, after enabling, it ran well.

For comparison, I get a perfect frame rate on an iPhone 14.

Whatever computer you’re using must be slower than a 4 year old phone.

Just enabled a couple of flags (#enable-vulkan, #default-angle-vulkan), now it's good.