Thanks for playing!
Off the top of my head, I am not sure what texture issue you are referring to, but its probably just placeholder geo I forgot to remove tbh. The rock thing is a problem, thanks for letting me know :). The pistol has infinite ammo, it just has to be reloaded with "R", I probably shouldv'e made HUD element to the point that out. Also, the game is made in Unity.
Really thank you so much for playing and leaving feedback :) Means a lot!!