Unfortunately it doesn't work in browser just yet because of Itch, we'll try to get it working but we recommend playing the DOWNLOADED Windows version for stability. Also, the game is only 200~ mb, which is very small!
Understandable here is a link that helped me when I first started to publish on itch.io with unreal engine this may help you also
https://youtu.be/KQkG2KElVxo?si=iZsgRLWMXrxB8M6X
This was made in Unity, also, I typod, this game is meant to be played locally via download, and works best on Windows