If you want to try out new features sooner such as dark themes, pull-to-refresh, swipe-to-delete, and various UI enhancements, then you may want to join the Beta program. If you want the opportunity to give feedback on new features and help influence the app's future direction, this is also your opportunity! Or, if you just want to help out making this app better by helping with final testing, I'd appreciate your help.
Simply email me at firstname.lastname@example.org. Use the Gmail account you use in Google Play (or include that in your email) and I'll send you an opt-in link, after which the next version will appear for you in Google Play. If you change your mind, simply let me know and I'll remove you again.