A very polished mini game! Making the challenge time based rather than turn based makes for a great combination. Now it's not just a roll of the dice, but also making sure not to press the checkmark when getting a "Smaller than 1?" prompt, which I unfortunately failed to do. (:
The way the music changes based on the multiplier at hand, and the great sound effects makes for a pretty complete package. Not much to say to improve here, other than to perhaps add some local/global highscores!