Spent a lot of time on this game. It has a good amount of play time- the first energy refill isn't too expensive and you can watch ads to get a lot more. But I've run out of levels so I've no motivation to play. I came back for the Valentine's event and had a few new levels which I completed quickly. The main thing I noticed in my month away is the daily challenges are now unreasonably hard. I used to be able to do them in about 100 energy. Now it's 300!