Hi, not sure if this has been asked before already, but I would suggest to have the Android app send grouped notifications.
I receive several dozens of Shiritori notifications every day and it takes quite a while to manually dismiss each of them one by one. It would require something called a 'group summary' in order for the Android device to understand that these Renshuu notifications can be grouped together. Afterwards, such a group can be dismissed with a single swipe which saves time.
I usually just tap a single notification to launch the app and move from Shiritori game to another from within the app.
