This fun, addictive, and nearly perfect casual game has a few defects that have forced me to abandon a regular and survival runs. The game requires you to level up your birds if you want to get deeper into the game, which means paying attention to “Goals”, level ups, and pushing your birds through survival runs to increase their damage output. You can play casually without doing Events, Goals, or Survival, but you’ll eventually reach an island that is too hard to advance past until you “level up” your birds, damage, and abilities.The latest bug I encountered seems to happen when using Bubbles’ ultimate in the first row. I’d report this as a proper bug report, but the Rovio support web site is information only, and not very helpful even with that. Kudos to the developers, however, because even when I run into a defect, I can press “pause” and then “home” without impacting game stability, and then start over. As a former developer, I can tell they’ve done the work to make this app playable and durable in spite of the normal bugs that slip in over time.This game is included with Apple Arcade, and is mostly bug free. I appreciate this novel approach to the classic Angry Birds universe. Well done Rovio team!