Great concept, however, the app is too dependent on ads to function at a bearable pace. You will be shown an ad if you don't want to anyway. No way to collect crystals other than premium membership. I've tried watching ads to grow plants but my patience is wearing thin after a month of use. Edited to 1 star: Re-installed it and instant dislike. JUST ADS, ADS AND ADS. Full 30s NON-SKIPABLE ADS. Everytime you level up, full ad. Want a better experience? Ad.