Hey @AtymTima!
We have noticed the size issue as well and will optimize the game if we decide to move forward with porting the game to mobile.
When you say following the mouse, what do you mean? The drone follows the direction that the spinning red radar under the drone is pointing in when you click, but if that's not clear we need to work on our UX. Would it be more intuitive if the command button was the spacebar instead of a mouse click?
Thanks for the feedback!