I really enjoyed this. The start is indeed slow, but you can really feel the progress as you make it. Once you go through a few worlds and upgrade your POW it becomes very easy. Not really an "idle" game as it only accumulates a multiplier while you're away. Some people don't like the random selection of multiplier, but I think those people are playing wrong. You should usually aim for as fast multiplier as you can, not play for hours to build up one more level. I finished in less than a month and POW is so high I can now go through the entire game in a few hours.