Support
Email support, answered by the developer
Write to support@dhstudio.dev. I read every message myself and answer as soon as I can.
The applications send nothing to me and have no analytics or crash reporting, so I have no record of what went wrong. The fastest way to a fix is a description in your own words: what you did, what you expected, what happened instead, and which phone you used.
Refunds
For refunds, see the refunds page. Purchases are handled by Google Play, which processes the payment and holds the transaction.