Moving app that can no longer be downloaded

Several years ago I purchased the toonia colorbook app. It’s been on my iPad mini since and my kids love it.

i just purchased a new iPad and can’t not find the app in my purchased list. If I google it it says not available in region. I’ve never changed regions. I’m very sad and not sure why it’s not there

I am wondering can I somehow move the copy from the mini to this new iPad?