ShadowGun Legends Android Gameplay - Getting to Rank 15

Been having fun playing ShadowGun Legends on my android device. Its a free looter shooter game with a few microtransactions in the game. It runs pretty well on my device, exception of a few here and there hickups, but other than that, its a pretty good game. Here's a video of me playing it and getting to rank 15, not sure how high I can go on it though. I play this game every other day.