Just played through the beginner pack.
You've done a good job introducing mechanics incrementally.
Also liked how there were some more cathartic levels thrown in like the one where you hit one bomb and set off a chain to destroy the whole map.
This is defiantly a better way to start out the game, maybe you should put the extra levels I was playing the first time behind a unlock achievement to stop noobs like me from just clicking whatever to get to the meat of the game :P
Overall my impression of the game has stayed positive, a very well done little game.