This is a new bug with the itch.io launcher :( You can fix it like this:
- Click "uninstall" then click "uninstall now" when prompted
- Click "install" and select GirlCrush1_2cB.zip from the list (do not install GirlCrush1_2d!)
- Launch the game
Even though GirlCrush1_2d and Girlcrush1_2cB are exactly the same file, one of them is designated by itch as 'play in browser' and the other is designated as a standalone, and only the 'play in browser' one works in the launcher. Sorry for the late response!