why i can't open the game after i dowload it
As avoidancepolicy have said, please make sure to extract the files first. I believe on Windows these days they would let you access the compressed archive as if you’re accessing a folder, but you cannot run the game that way.
Please download the game through itch.io client. You can download the client from here: https://itch.io/app then download the game and launch it through the app.
If you're using Android, have you tried installing it? Keep in mind that to install the game your Android version must be at least 10 or else it will not install at all. Make sure you allow unknown sources to install apps.
If you're using a PC/Mac, try opening the .zip file through 7zip/WinRAR and extract the files to a folder you can access to.