"It seems like, when you make an error, and you get to the end of the list (like 25/25), it says it fails to defuse. Is that supposed to happen?"
Yes! That's intentional. If you make even one mistake, there's a random chance that the bomb will either be successfully defused or fail, forcing you to try again.You can restart the game if you want, but if you keep playing despite making an error, you can still earn more points. Every correctly typed word gives you points, and some words can even award an additional 5 bonus points. So it's still possible to beat your high score even if you make a few mistakes.
Just be careful—too many errors will start reducing your score.
