We take your privacy very seriously. Beyond the information Apple provides to developers that you can decide to provide, Mechanical Animals uses no third-party analytics frameworks.
Other than collecting anonymous statistics on feature usage (in order to prioritize which features to focus on), Mechanical Animals logs no information on you and has no interest in user accounts with emails, passwords, etc.
In TestFlight beta builds (not publicly available) Mechanical Animals may log some information to your device that you can explicitly choose to share (will not leave device otherwise). Mechanical Animals does not sell or rent your data.