I really like this game and I've played it a lot some time before. Now I've decided to return to it and it just crashes on start with an error like "Failed to post notification on channel "null". I think this can have something to do with Android version. I'm talking about requirement to create a notification's category before sending one. I hope this will help you and fix will appear soon (the last update time (about a year ago) does not help me but I believe in you still)