First off your game looks so cool… what is it? I spent a good minute with my magnifier looking over the art. Very pretty.
Second, did you know that Apple is going to require a complete redo in just a few months in order to support their next silly OEM crap:
That change is almost certainly going to force you off of 2018… I know this because a) Unity isn’t going to cut a fresh 2018 build to support this new Apple nightmare, and b) it will affect me as I am still building all my iOS games with Unity2018.
Finally, I’ve updated a LOT of projects a lot of different times and really the main issues are almost always with third party stuff like purchase systems or advertising, and they usually have solutions, but yes, those solutions do take time to discover and implement and test… but if the alternative is death of your software, well, it’s kinda clear… 