I really enjoyed the game design (graphics and music). I think you should either make it more competitive (bonus for not using bomb/shuffle, awards for long streaks etc.) or more relaxing (removing time limit). Also, more levels would be nice as even the hardest level is quite easy when you use shuffle.
I really enjoyed this game in lower levels. I got bored after level 80 when I had a fully functional city with all resources and a double wall around me. There was nothing to do but wait for a zombie boss (and then repair a part of the wall). I hope you develop the game further, because it has great potential!
The bars for energy consumption and productions are not right sometimes. When I had 49 production the bar for consumption was longer even though the actual value was just 34.
Thanks for the suggestion Yentz :-)