I found myself playing this for I think over 2 hours. I loved Diablo 2 and was always wanting to make a flash version of it or at least see one some where so thank you!
Everything was great but of course I have some complaints :
The enemies were pretty boring and unimaginative. A green blob that shoots blobs at you? You could have done better!
I found that once you get to the last 2nd last act, the graveyard, the items are pretty much as good as they'll get for the rest of the game. I obtain the best gear very easily so it was kind of a shame.
In the hard mode I don't think that it was balanced properly. You recieved little or no experience for killing insanely hard enemies. So, hard mode was basically impossible.
How come you can't start a new game? This sort of game is one where you learn a lot on your first play through so naturally you want to play again to kick some ass but every time its the saved stats. I could be missing the button but I'm pretty sure you don't have one. PS. It's incredibly easy... use .clear();
My dragon got maxed very easily as well, you should have made him go a lot higher than 600 health.
Overall a great game !