Ohhh I didn't even notice the target in the corner, I thought the target was the moving rocks
in such games the moving objects usually are the enemies >.< that's why I got confused :3
maybe you should highlight the target area (rather than white box/ red box) or glow, just anything to make it popup because the rocks and enemies all of them are also in white color, so the target area is kinda feel its in the background and not important to look at.
I played the game again and I won without any issues :3