It's still too short!
These are good, and I really like this series...however, these flash should not be a series at all. I think it would have been better if you had wait a bit longer and released all of your DD flash together.
For example, why not actually have Billy fight througha few levels, THEN arrive at the Casino? Also, why skip straight to duke and then make it so easy for the Lee brothers to beat him?
And what the hell is up with the dog bark music in the elevator?
Anyway, I'll be keeping an eye out for the next part(s).