A simple workaround would be as follows:
Create a duplicate of your app using the same spreadsheet. Rename it to “Staging.AppName”. When you’re happy with how it looks and ready to release the changes, head back to your original app and rename it to “Old.AppName.” Then, simply rename the Staging app to the original app name, and it should update immediately. Once you do this, you can delete “Old.AppName” and start this entire process again. Hope this helps!