Hi sylena,
Congrats on shipping your game. While this game technically doesn’t have a 20s time limit, since each individual die roll only take a couple of seconds and is independent of the next, I’m not going to disqualify it.
That being said, you should spend some more time on this game. Maybe make it so it adds up your die rolls in 20 seconds with a goal to get the highest (or lowest) possible total? Or longest streak of the same number. Maybe clicking the die in a certain way manipulates the result (kinda cheating, but that’s exactly the point).
Add some die rolling sounds effects. Maybe some music? Have fun with it :)