Sentinel 4: Dark Star is a tower defense game that costs $2.99 and has in app purchases.
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Pro Lots of maps to play on
There are 26 different maps to play on in game giving the player a lot to experience.
Pro Great looking 2D graphics
The 2D graphics for Sentinel 4: Dark Star is nicely designed.
Con Contains in app purchases
For what is an already up-front paid app, it is disheartening to see in app purchases that range from $1.99 - $46.54 per item.