His has to be a bug with the itch client. I installed the client, looked at my app, and it says web only.
I verified my game's page has the checkbox "Meant for web" (sic)
It's strange it doesn't just launch a web browser for you here and it's giving an install option...
You can play on web here for now. Sorry for any inconvenience. Once I have better obfuscation of my game's data files, I'll re-release the exe version again.
Game is like, 80% done, so next update might just be steam page... thanks for your interest.