Tomorrow Polytopia will be 7 years old. Cross platform compatibility should be feature by now. Don't want to sound like a mug but please consider this feature addition in near future. Would really make it more competitive and accessible.
I'm a software dev myself, so would like to understand what's stopping you guys from doing that. I get that Play Store/Apple store, etc. will have different payment pipelines but you can store user purchase details centrally and just charge them a new platform fee post which they can access their purchased tribes on the new device (like Supercell do it)
This will cut your revenue definitely but it's a sacrifice to make this game better on the long run