Challenging little game, reminds me of Aim Trainer games a tiny bit. Difficult but not outside the realm of the average player's ability. Downloading and playing the game was very easy, with no issues. Well done!
There seems to be a slight issue regarding missing a green target or hitting a red target. When you make a mistake, the next target appears and disappears significantly quicker. This leads to a scenario where if you miss a green target and the next target is green, that appears and disappears quickly, which registers as a failure and starts the problem again. I had a scenario where this happened 8+ times in a row meaning I lost over 160 points at a rate that even professional FPS players would struggle to keep up with. In addition, the lack of feedback except for the score updated would make it a little tricky to determine whether you successfully hit the target. Finally, is this really a Single Control game? Moving the mouse & clicking?
In the end, this does the requirements in a way, with only minor bugs (if it is one) to be addressed. There is room to expand this and improve the polish of the game, but for the timescale that this project was made in, this is more than enough.