Dr.Hasan Thanks for the feedback, the game is the result of like 4 iterations plus tons of analytics behind...
About the ads, that's pretty much out of my hands :( there's an expected match rate but fails from time to time (AdMob). I been posting bugs and receiving fixes on the Admob plugin from Scirra, they did some changes based on some exceptions I gathered, but it seems the Admob team has been messing around with their service. Anyway, the match rate is acceptable, around 90% ... you may try later just to make sure it was a temporary problem.
And your game looks great too. According to Game Analytics, Word games are the top ones with more retention.
Your game feels fun... I'm not a english native speaker so I had a hard time lol... but there were a couple of things that failed:
1.On the crossword game I pressed help and the game closed :o
2.I couldn't pass level 1, it seems there was some kind of bug since I wrote "Low" and the game told me I was correct but then the crossword grid didn't filled.
3.I coudln't figure out the last word with C,L,E,E,O,M (3 letter word) and ended with a W (wasn't low) You may need to check if it was my mistake or a game bug.
And I got intrigued by this:
1. When there are no users connected, do you mock up a local play as with another player?
2. What ad service are you using? did you connected it with enhance?
The game seems to have a lot of design behind, congrats!
You may need to market it more and would suggest to polish the text objects to match the graphs (imo, just my subjective recommendation, I'm not saying is wrong or anything, I'm just thinking on a better UX)