Space Marshals is a tactical stealth twin stick top down shooter for Android that costs $4.99 and has zero in app purchases.
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Pros
Pro Loot reward system
Space Marshals has a loot reward system where in after the player completes a level, depending on how high their rank is for completion allows for a loot reward of corresponding level.
Pro Stealth-centric
Space marshals gameplay is built around stealth gameplay where the play sneaks around pre rendered stages trying to complete set mission requirements. There are rocks that can be used for distracting enemies as well as plenty of weapons including grenades.
Pro Controller support
Space Marshals has built in HID and Nvidia Shield controller support.
Cons
Con Touch controls not as accurate as they need to be
Twin stick shooter style game do not often control great with touch screens due to the lack of tactile feedback, while Pixelbite tries to mitigate this issue as much as possible, it is still a problem in some places.