Gem Boy Jump HD is described as follows:
Gem Boy Jump HD is a platform jumping game that uses precise tilt calibration for accurate and fast-paced gameplay. After a countdown from three, your Gem Boy automatically starts jumping, but you've got to control his horizontal movement to reach new platforms without falling.Gem Boy Jump HD has a rating of 5.0 stars in Google Play and 2.1 stars in the Amazon Appstore.
Reaching New Heights
Your objective is to collect gems. The higher you climb, the more gems you'll collect. There are three kinds of platforms; some you may only use once, some are permanent and stationary, and others move horizontally. Gem boy, on the other hand, is never still; he is always jumping. To keep Gem boy on a platform while you contemplate your next move, simply refrain from tilting your device. This guy is spring-loaded, so it's easy to send him to his final resting place if you don't stay calm, cool, and collected.
Gems and Other Goodies
Platforms carry more than just valuable gems. Power-ups, such as the leaf, shield, and magnet, will help you on your gem-collecting adventure. Collect star launches to advance past tons of platforms at once. Hearts will earn you an extra life.
In your search for valuable gems, you can't expect to be alone. Gem thieves can be found jumping from platform to platform trying to steal the gems before you reach them. Avoid colliding with the thieves. They'll either take your life, or all of your gems.
New Worlds and More Challenges
Gem Boy Jump HD offers two game modes, three difficulty levels, and four themes. Local and global high scores are automatically saved and recorded in ScoreLoop. After each game, you're given stats: game time, gems collected, power-ups collected, star launches, gem thieves stopped, platform jumps, and an ultimate score.
Jump through the sky, space, ice, and lava on your journey for gems with Gem Boy.
Judging based on that, it sounds like the app is probably best judged by the Amazon Appstore ratings. The reasons for the low ratings: the app is reportedly very buggy.
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.