Quote: "My reactions are not that great though, I only managed a score of 30 after numerous tries"
lol
Here was my 3rd or fourth attempt... (see attached)
I hit the extra life then a 100
I like the game but it does seem like it could be too difficult for some people.
If the green box you land in was wider maybe, then you could still get some points if you didn't hit it perfectly centered. (you would get a bonus for a perfect hit)
That might make the gameplay last longer and make it more fun for the 'reaction-challenged'.
Then, the green box could shrink as you progess.
Just a thought.
Very simple but fun game.
I wish you much success on your sales.