On the topic of chicken invaders on mobiles
sideloading is possible too ( not on iOS ) but idk if you want to go down that road (one example being putting games up on epic store “partially”. Fortnite is installed from epic’s site right now afaik ). I assume discoverability of app is of interest too, not just the means to download/pay
I hope it helps (please dont dm me since this is a burner account and i wont be able to reply).