*disclaimer - game is in an early but very playable state, not all of the world, quest, etc mechanics are in place yet and the card collection element needs some work to feel more like a CCG*
This game is not just another angry birds clone but a more novel take on the genre - future features should add huge amounts of replayability to the game - random world map, quests and an interesting CCG mechanic (for weapon collection and upgrades). The devs are open to player feedback and suggestions and active on the forums.
At the moment its highly playable and addictive (I daren't load it up while I am trying to finish a few other games such as ni no kuni as my last 'quick' go stretched to over 2 hours and I had to drag myself off M&M to go eat), some levels will frustrate you but also you get that must have one more go feeling that an addictive game requires.
Once this game gets random maps and quests I can see my free-time just being eaten away...