The new version has "in-app payments". But don't worry, nothing is locked. It is just for a voluntary donate button. If you intend to donate, it might be a good idea to just donate a small amount at first. I haven't been able to test whether I actually receive the money so far.
Please do try to do some testing, not just playing. The faster we find the bugs the faster i can start working on new features. Examples of what to test:
- Rotating the screen
- Completing challenges and tutorials
- Saving, loading
- Reading descriptions to make sure they are accurate
Only English language is available so far, I will post requests for translations of the new strings soon.