[singularity2001]

A Unity wasm empty scene is ≈1MB:

https://blog-api.unity.com/sites/default/files/styles/focal_...

couldn't find a live demo to confirm, which strongly speaks against Unity being anywhere as flashy.

[_jezell_]

Unity is not a good example, it's bloated as hell and takes like 15s minimum to load a square. It wasn't built for WASM and uses a toolchain that makes WASM hard.

Bevy loads pretty instantly in comparison. That's where I'd invest my time if I was doing web games.

https://bevyengine.org/examples/

[fxtentacle]

1 MB after compression. And only if you turn off physics and limit yourself to 2D