It's great. Some feedback:

The explanations of wrong answers are a mouthful.

For the first example today:

"Not quite! Ahoy matey! We need a small fix! Use in search of instead of for when looking for something. Happy treasure hunting!"

Remove the title, and cut straight to the point:

"When looking for something, use in search of instead of for".

My brain is already in overdrive trying to figure out these grammatical puzzles. I don't want to have to parse another whole sentence to get the correct answer.