This is a runner game.
Basically;
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User is trying to reachs finish.
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User is passings through the door and taking gun from the doors.
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User can shoots enemies and obstacles with gun.
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If user can kill a enemy, enemy drop one bullet.
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User can takes bullets from door, place and if dead enemies body.
Swerve System and Gate Mechanics are used.
You can see images from game.