There is an issue where some advertisements crash as they attempt to load or when they are near the end of their length, which means if you try to double hours worth of resources then you will lose them. This is really annoying when you are at a point in the game where things take a lot of resources to upgrade.
Edit: Ban and remove the advertisement for Gardenscapes. It literally crashes the game every single time. Lowered my score because of it.
Fix this issue, and I'll gladly raise my score to 5 stars.
Second Edit: Now the game only crashes when I play a commercial 50-20 % of the times. And sometimes I even keep the bonuses when it crashes.
Third Edit: Game crashed thanks to a stupid ad to extend the double resource time, which caused my game to reset and all my progress was lost! I don't know where to turn to have my save restored, which sucks. Hours and money spent wasted. Will NOT touch again unless someone helps me restore it.
Fourth Edit: I managed to contact someone from the dev team and although they could not restore my save, I got a code which helped me get to a stage where getting back to where my save was will take no time at all. Thank you very much Pomelo Games for helping me get back up on my feet! Holding out on that last star for a bit to see how the ads are doing.