Download and Install Emscripten
Open 'raylib-5.0_webassembly'. Copy raylib.h to 'include' and libraylib.a to 'include/web'
Set EMSDK_PATH and BROWSER in the makefile
Run make test_web and enjoy the demo
Change PROJECT_NAME, PROJECT_VERSION, BASE_WIDTH, BASE_HEIGHT in the makefile
Add build targets for other platforms in the makefile (more info here)
Customize the embed shell
Install itch.io butler. Create an itch.io page for your game, set ITCH_USER and ITCH_PAGE in the makefile
Run make release_web to build and zip your game. Run make publish_web to upload directly to your itch.io page