OpenTTD! https://play.google.com/store/apps/details?id=org.openttd.sdl&hl=en&gl=US
It’s a FOSS version of Transport Tycoon.

There is a good post on Lemmy about Hardening privacy on android https://lemmy.ml/post/54596

I used iOS for 4 months around Covid and then gave up. File managing is horrible. There is no Calculator app? and many more little problems, but these two were very weird to me.