Galaxy Ninjas is free (but ad-supported) in Google Play. It is normally priced at $0.99 in the Amazon Appstore. As we've noted before, there are sometimes differences in pricing and availability between the two marketplaces.
Galaxy Ninjas is described as follows:
Galaxy Ninjas is an epic 2D Ninja game! Slay aliens across multiple levels in the galaxy while dodging obstacles, collecting powerups, and surviving insane boss battles! Collect coins and head back to the Dojo to customize your Ninja with new outfits, weapons, and powerups! 4 Different modes include Classic, Expert, Endless, and Insane for the pro players!Galaxy Ninjas has a 4.1-star rating in Google Play, and a 3.5 star rating in the Amazon Appstore.
There is a very similarly named app, Galaxy Ninja, in the iOS App Store. It is not by the same developer, however, so don't get them mixed up. It is priced at $0.99.
We continue to be disappointed by the Amazon Appstore FAOTD. It began promisingly enough, with Angry Birds Rio, but we've gotten tired of the endless games or niche apps, and especially apps which have no uptake in Google Play, and seem to be FAOTD as a desperation move by the developer. We'd like to see free versions of say, Office-compatible software or useful utilities such as CalenGoo instead of niche apps or endless games.
what it means to developers.
Amazon.com opened up the Appstore despite a lawsuit by Apple, which has previously trademarked the term "App Store." Microsoft has filed an appeal against that trademark, saying the term is too generic. Amazon.com has responded to the lawsuit in the same manner.