We are looking for a money-friendly way to beta-test our mobile app puzzle game before launching it.
Based on my own experience building indie games I'd recommend these Reddit and Slack channels for beta testing:
Also, just give it to your friends and family and you can record their interactions with it using something like: https://www.lookback.io/
If you want to discuss how best to design customer interviews / questionnaires for your specific app, to assess what you need to change, what to keep, etc. feel free to send me a message,