You could greatly improve on this.
First, let me list the things I like;
1. The idea
Next, I list the things that I don't like and could easily be improved upon.
1. Whats with the cursor? It's fat, poorly draw, and distracting. How about a smaller, more neatly draw cursor so I can shoot without having seizures.
2. How about the option to change the amount of time you have, like 20seconds, 40 Seconds, 1min, 2min, 3min 5min 10min
3. Wouldn't I be better if you could only have a limited time to shoot each target?
Just work on it, this would be a fun game, this is more like something you play while you waiting at a loading screen.