[ANDROID][2010s-2020s] looking for this futuristic styled 3rd-person shooting game

So in this mobile game, you had different maps of varying difficulty, where the robotic enemies would come as waves, some waves were just a bossfight.Some settings I remember are a desert, Mars, on top of a tower of sorts, and mountains.

There was an armory thing, where you'd buy and equip weapons, "pets", companions or whatever that would help you during the game in different ways. You could choose the type of soldier you controlled, which all had different stats and special abilities. Some of them were clearly robots, some more humanoid-like.

You would purchase things with gems, the process of acquiring which im not sure of.

There were many sorts of different weapons. Some would just fire bullets, then you had energy weapons and explosive weapons. All of them would have different stats, like huge damage in one blow vs. constant spray of small projectiles, etc.

I have a vague picture about there being also pvp and co-op game modes.

Not sure if this is any good clue but I remember playing this during the COVID lockdown, although I might have also played it prior.

Apology for bad english