OTTTD is a tower defense rts games that costs $4.99 upfront and also includes in app purchases that range from $0.99 - $46.90 per item.
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Pro Interesting mix of tower defense and real time strategy mechanics
At its core OTTTD is a tower defense game but it has an added mechanic of "heroes". Heroes allow for the layer to use them in ways on maps like one would in an RTS, placing then=m in specific tactical areas to utilize their special skills such as sniping or being a mechanic that fixes towers.
Pro Cloud save and achievements via Google Play Games
It supports Google Play Games features, such as cloud saving and achievements.
Con Not recommended for phones
With so much happening on screen OTTTD is not recommended for phones and their small screens.
Con Paid upfront and includes in app purchases
OTTTD is a paid upfront game and yet it also includes in app purchases that go as high as $46.90.