You can only delete a published game if there are no drafts created and no A/B tests running.
Access the Games Console with your developer account.
In the top left corner of the Console, click Applications.
Find your previously uploaded game in the list and click on it.
Go to the Published tab.
At the bottom of the page, click Remove. The last deleted version of the game will appear on the Draft tab.
Complete deletion
Warning
Before completely deleting a game, you need to unpublish it.
Go to the Draft tab.
At the bottom of the page, select → Remove. After this, the game cannot be restored.
Note
After deleting a draft, the empty application card remains as an entity for action history. To see it in the list on the Applications page, select on the right and uncheck the Hide deleted apps option.
Restoration
Alert
All materials on the Draft tab are stored on Yandex's server indefinitely, but when a draft is deleted, they are permanently removed, and it becomes impossible to restore the game.