I found a couple deals for iOS games that I thought were worth mentioning. I've included some basic info from metacritic but I'm not sure how much I trust their aggregated reviews/score. However, all the games listed below are stylish, cheap and have over 5k reviews in the App Store so I feel they are a safe bet.
Grimvalor $1.99 (regularly 6.99, lowest historical price)
Metacritic 86 (#14 Best iOS Game of 2018) metrovania style game https://www.metacritic.com/game/ios/grimvalor
Mini Metro $0.99 (regularly 3.99, last at the current price 2 years ago)
Metacritic 89 (#26 Best iOS Game of 2015) metro map arcade puzzler https://www.metacritic.com/game/ios/mini-metro
Oddmar $1.99 (regularly $4.99, last at the current price 1 year ago for about a week, goes on sale once a year)
Metacritic 89 (#6 Best iOS Game of 2018) 2D Viking platformer