Seems a tad too easy to cheat, but hopefully people wouldn't do that because there is no value in it :) https://i.imgur.com/Y21qW2E.png

But jokes aside, I think it might lean a bit too lenient and accepting of answers that wouldn't really be correct. It's taking the conversation very literally when deciding if you pass or not, and the auto-correct does seemingly a lot of heavy-lifting, maybe even too much.

Really like the overall idea though, simple and could be really effective.