Harvest Hills is an extremely hard episode, with the mean of 6.33. It contains five hard levels: 3531, 3534, 3538, 3539 and 3541, three very hard levels: 3532, 3537 and 3540, three extremely hard levels: 3542, 3543 and 3545, and one nearly impossible level: 3533. Overall, this episode is much easier than the previous episode, Wafer Wonderland.
Based on the background, this episode appears to take place near Fruity Farmland.
This episode was actually released on 20 June 2018 together with Wafer Wonderland, but because the version of the app is too low which is 1.125 and that version is only up to Wafer Wonderland, this episode wasn't released together with the last episode until 26 June 2018, Microsoft Store has been updated to version 1.128 and this new episode presented at the same time.
Because of this, Harvest Hills is the first HTML5-exclusive episode to be released on a Tuesday.
A harvest is the process of gathering crops, fruit and vegetables. It usually happens in the autumn/fall. Coincidentally, if the trend of one episode a week had continued (as opposed to two episodes being released in some weeks since the end of Flash version) this episode would have been released in the fall (September 2018, to be specific).