Funny that a game about math would get the grade calcs at the end wrong.
It says I got 26/36 right, which is 74% and a B.
26/36 = 0.72222...
And by any grading standard I've ever seen, A >= 90%, B >= 80%, etc..
I'd agree with the timer being too short still. And take the colors out of the text on the probability question. I have slight color vision problems, and by the time I could read the text, the counter was up.
Please change the name - the only thing this game has to do with sniping is the fact that you're forced to look through a scope which blocks half the screen. The damage is the same no matter where you hit and you certainly don't have to work hard to line up shots.
The game is easily completed without the tools which are supposedly the most important part. No real challenge besides picking the right upgrades.
 "The Maths quiz"){kind=icon}
 "Snipedown"){kind=icon}