Still really enjoying this, finally got a couple of "supernovae" tiles on my last game! However it's definitely burning through my battery in a big way, particularly when it's in the background - Android's battery stats are showing 5+ hrs "Keep awake" time since the last charge, which is way more that I've been playing it, and way more than comparable apps that have been in the background.
Battery use very high
I just published an update which should improve "energy efficiency" of the game. Also that bug you mentioned in the previous post is finally fixed too. I have uploaded the Android version here on itch.io and on Google Play the update will become available in a couple of hours.