This is my absolutely favorite Angry Birds game of all time. I haven't played it early into my childhood, but I still know that it's the best game, that was unfortunately discontinued by Rovio. It has awesome music, levels on a lot of different themes, exclusive game characters. This game is absolutely iconic to it's franchise, because there was a couple of characters that were first introduced with this game, and it's literally the second game in the franchise. There's genuinely lots of cool levels that would be awesome to get officially for this game's fans, because they are really "starved" for the classic games, that in my opinion, should not be neglected.
The game was in fact released on PC and the demo still is obtainable officially only through the old CDs, and even then the activation servers are down. It was discontinued pretty early on, 2014 to be exact, and that's why it doesnt come with all the latest levels, but it still contains a solid amount of levels in it's final update.
I feel like this game would have a giant portion of it's fans wanting to get it, and I too, would love for it to come back.