I appreciate your efforts, but from my quick testing I see that I can enter anything I want in email field, so this is acting more like additional passphrase.
I don't see any real benefit of adding real email address, and it can only hurt newbies who (by mistake) could generate keys while being online.

Any random generation and mixing several sources is not really creating true randomness (based on my research).
Using something like good old casino dices and calculating last word is much better option in my opinion, but one downside is much slower process.

I wouldn't recommend anyone using this tool until we see code review or audits from security experts, but it should be fine for experimental purposes.