Fix bugs and improve game stability.

The recent minor update yielded a neutral net impact, despite an Android rating increase of +0.36 stars to a post-update average of 3.65. While the release resolved a level-resetting bug on reboot, the rating improvement is heavily caveated by a small pre-update sample size of seven reviews. Furthermore, new player complaints emerged regarding progress loss during device transfers and the paywalling of offline play.

Fix bugs
Add more levels