I’m just making this post as the App Store requires a “support URL”.

You can email customer support about technical issues and refunds here:
kupo.games+ios@outlook.com (iOS)
kupo.games+play@outlook.com (Android)

You can chat with other users and get gameplay advice on our Discord:
https://discord.com/invite/9NdK6Wh

You can find puzzle walkthroughs and video playthroughs on our YouTube channel:
https://www.youtube.com/@MattRoszak