For guys, who get no traffic:
Maybe reason is too narrow settings of your ads group.
My first adgroup have settings: Search match OFF, exact match for keywords plus a few auditory targeting options
I still get no expression here.
I made two more adgroups, one with broad match for keywords, and one with search match ON (without any keywords), and turn any audience targeting off.
Now it works for me even with low bids (like 0.05 - 0.1)
Unfortunately, traffic is still low. For example, stats for yesterday: 166 impressions, 18 taps, 7 conversions.
I've tried to play with bids, but even with much higher bids the traffic was the same.