I enjoyed the game right from the beginning. As you go along you build on your skill of previous levels. It took me a while to work out that there are two levels of rewards. One award by completing the level your own way and the gold award by following chiefs instructions. Some are devilish hard and every second counts. It involves decisions on spending money on helpers or not. This game grows on you by the minute.
Being a Time Management Game addict, I would put this game in the 'relaxing' category. It is not simple but is only takes you at the most 3 tries to finish one level. I enjoyed it.