If you’re looking for fun, arcade-style games that also offer some amazing eye candy, you’ve got to try some of the apps being created by Hexage Ltd.
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Robotek (4.5/5 stars, parental guidance suggested, currently FREE and currently comes bundled with a $1 Amazon MP3 Store credit) – From Amazon:
Robots took over your world. This is your chance to take it back. Humanity had fallen. In the great robot uprising, machines took over the planet. Empire of Machine is the new world order. It’s time to take it back! One node at a time.
Rip through your enemies with lasers, electrocute them, or fry them with microwaves. Deploy your own robots to fight for you or steal them from your enemy. Protect and upgrade your forces or throw them away in a ruthless wave of destruction. 
Get experience from every battle, level up, gain power, and crush the Empire of Machine!
Check out the Strategy Guide for additional tips and tricks:
http://blog.hexage.net/2011/05/27/strategy-guide-to-robotek/
IN-APP PURCHASES
Robotek is free to play, supported only by optional in-app purchases. You can finish the entire game without re-charging your energy. Play it safe: Learn all of the symbols in tutorial. Do not challenge nodes tougher than you. Master the gameplay, level up and go against weaker nodes first! You can always reset the campaign in Options and start from scratch.
FEATURES
– Unique blend of strategy, action,and RPG
– More than 200 levels spread all around the world
– Rewarding skill system with more than 30 levels
– 9 upgradable slot symbols to fit your own style of play
– 4 special abilities including the devastating Nuke
– Play thrilling hotseat duels with your friends
– Online hall of fame–your scores can only grow
– Facebook leaderboards–compete with your friends
– Signature soundtrack by kubatko (www.kubatko.info)
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Radiant Defense (4.5/5 stars, parental guidance suggested, currently FREE) – From Amazon:
Radiant Defense is a tower defense game set in a vibrant universe invaded by countless alien hordes.
Build your space fortress any way you wish, set up wide variety of weapons and traps and let the invasions begin!
FEATURES
• Tower Defense set in the Radiant Universe
• Build your own route for incoming waves of enemies!
• More than 300 waves of aliens across 10 missions
• 9 upgradable weapons to kill the aliens with style
• 3 superweapons of mass defense
• Online hall of fame – your scores can only grow
• Signature soundtrack by Kubatko
IN-APP PURCHASES
Radiant Defense is free to play without any ads, supported only by in-app purchases. Each in-app purchase greatly enhances your tactical options.
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EVAC HD (4/5 stars, all ages, currently priced at $1.99) – From Amazon:
Exciting mix of arcade, action, stealth, and puzzle genres
24 meticulously designed levels, each with a different twist
Colorful visuals optimized for hi-res devices
Facebook connectivity: compete on leaderboards, challenge friends, and share achievements
Signature soundtrack by kubatko
Run for your life through a series of increasingly devious hi-res neon mazes, chased by countless relentless security forces. Mixing the best parts of arcade, stealth, and block puzzle games, EVAC HD will challenge you to outsmart, outmaneuver, and seek revenge against the enemies trapping you and your friends.
Replay levels to get your best total high score
Take EVAC, the smiling pink square, one step closer to freedom by gathering colored dots in order to open exits and move through levels. Collect dots, avoid being hit, and destroy your enemies with power-ups to increase your multiplier and your total score. Replay levels to beat your own goals and top the online leaderboards.
Be as efficient as possible by setting your own touchscreen control point based on comfort and convenience. Calibrate it on screen during gameplay if you need to make an adjustment.
Be CreativeUse stealth to avoid encounters and prepare traps for your enemies, or just rush as fast as you can right in front of their eyes. Figure out how to beat the system and destroy your captors in 24 action-packed levels. Steal from your dark adversary, SHADOWBOX, and leave his world and red square minions in ruins! Beware as he taunts and comments on your progress and fight on through!
Get help from the yellow square, CRATOS, and his friends, the yellow blocks you encounter in the mazes. Receive his advice and push the blocks around you to crush your enemies and to press switch pads for puzzle solutions.
Hide in safehouses to evade the attacking red squares
Duck behind walls to avoid enemy sightlines
Find the ghost power-up to move past baddies and force field barriers
Collect shock power-ups to zap and stun foes that get close to you
Use the Aura power-up to radiate destruction and crush all incoming red squares
Sign in via Facebook so you can challenge and compete against your friends without ever leaving the game. Invite your friends by posting a link to your Facebook wall. View a list of your Facebook friends who play EVAC HD. Compare your high scores with those of friends on your leaderboard. You can even share your in-game achievements on your wall.