The best replacement for shadowgun is nova 3.

The best alternatives to shadowgun are rated as following:
★★★★★  nova 3
★★★★  shadowgun deadzone
★★★★  shadowgun thd
★★★★  modern combat 3
★★★  dead trigger
★  modern combat 4

Your alternative for shadowgun is not listed? Suggest!
Speaking about shadowgun, one probably shouldn't forget about moga.

Other search terms related to shadowgun and their ratings are:
★★★★★ moga
You have in mind a companion for shadowgun and it is not yet here? Propose!



Google Trends

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shadowgun
nova 3
shadowgun deadzone