Good word game.
The animation with the train is really cool and creative. There are multiple levels of play, from easy to champion. You can earn more coins by spelling each word correctly. Give the company some money and you'll unlock the more advanced levels. Or, you can opt to play and earn enough coins to unlock those levels and remove ads.
I did manage to find a minor bug: How many coins are required in order to unlock the Hard level? This is not provided in that popup.
I am the second person to rate against the choice of displaying the ads. I wouldn't have displayed the ads between the letter selection. That's a turn off.
Developer Response ,
We have plans to limit the ads to the word completion only. We'd make the changes in the upcoming update. If you tap on the coins on the upper right corner, a dialog box will appear that will display how many coins are required for each level.
Thanks a lot for your time and feedback :)