Hello! Thank you for playing and rating the game! I'm happy to hear that you enjoy it so far. As for the battery draining problem, I think it's the engine problem (it's far from being optimized, and even a simple game like this requires some extra power). If you ever find a moment, I would greatly appreciate it if you could test the Web-Browser version of the game and let me know if it behaves the same way.
Here's a link:
https://tyrving.itch.io/after-years-web-browser-version?secret=2xVhaOotNJrmXN445...
(a quick note: this version requires either Chrome or Firefox).