One of the more creative games I've seen in this game jam, and a very meta one so to speak!
Some of the words could be discerned via sentence structure and context clues, but others had to make me pause and wait for the auto-typer to fill out a letter because there was no obvious "lead" to go by (like "bees"). It's surprisingly very easy to spam letters when you're not sure what the word is, and this hastiness can let the timer running out before the auto-typer can provide a hint. A tendency to type fast also means that mistakes can quickly pile up even when you know the correct word, especially since the goal is to only fill up the missing letters, not spell out the entire word (a mistake that I kept defaulting back to).
This game definitely has a lot of potential to be expanded further, such as by randomizing which letters are missing so that players can't just memorize all the missing letters from previous playthroughs. Letting the program make its own sentences (or even accept custom words) could make a very fun typing game that others could try out (maybe even creating a code so that custom "sentence challenges" can be shared to other players).