Not too bad.
The concept is perfect - however you've executed it poorly, quite alot of the questions are way too long, meaning I don't have time to read them, dodge & answer at the same time.
Although, the game itself is challenging, it's not the same ol' easy game I can complete or end in 5 minuets, this game could possibly keep me and many others occupied for hours.
To improve the game, I'd suggest adding power ups that improve gameplay for a short period of time, like...
-Speed up
-Stopping the conveyor belt
-Lowering the amounts of knives (or slowering the speed they fall)
Overall, not a bad game - I'd recommend it for someone who likes challenges.