This concerns me as I have iOS 10.3.3 and have no intention of ever updating the iOS as I have way too many 32bit games that I don't want to lose.
Been playing this off and on all day and I'm seeing some room layouts repeated quite a few times, anyone else noticing this too? Maybe I just got similar seeds or something. Other then that and the button layout thing, I think it's been great fun. I've played a lot of RL and can't say seeing the similarities really bugs me at all, quite the contrary actually.
You don't need any in-app purchases. I've defeated Ignius (final boss) twice now. You just have to keep upgrading skills, and you get more than enough gold to do it on each run. I hope more bosses get added soon.
I do want to add the buttons are too sensitive, and it can mess up double jumps. Try sliding your finger on the button after you press it, you'll see what I mean. It feels like the "hit boxes" are larger than the buttons. This applies to all buttons, not just jump. I haven't tested further since my previous comment.