When financial instability forces him to teach English to immigrants, a heartbroken, over-imaginative New Yorker must help a ragtag bunch of foreigners pass the class or risk losing what little he has left.

Agreed with all the above.

Also, the stakes are unclear, or not specific. What does lose what little he has left mean in practical terms? Lose his house? His car? His mind?

I agree with Richiev. There needs to be a single moment that shows this financial instability - foreclosure warning letter or something.

"Heartbroken" - I think there could be a better characteristic or just remove altogether. There is no suggestion as to why he's heartbroken and the story doesn't seem to suggest a resolution to this.

"Over-imaginative" - what does this tell us about the character in relation to the story? What is his character arc?

Thank you Singularity!