Not sure if it's lag or something, but the sensitivity sucks and that's one of the things that tics me off the most in terms of flaws for finger-DDRs. The flash doesn't register clicks properly at times. Another thing I found annoying was that a held note counted for like 10 notes so if you missed it you're screwed. Also you fail too quickly after messing up.
2/5
Poor "handling" - half the time I turn the wheels stay in turned position, the other half they go back to normal position how a car is supposed to.
Poor physics - bumping into others can give someone a huge boost (not necessarily in the right direction)
Also out of curiosity, how many levels are there? I made it to the third boss the crazy fairy before I got pwned in its third form where is just starts shooting in every direction. If that was the last boss, then I'd consider the hard badge but since I doubt it is, I'd rather not invest the time in something that doesn't fit my tastes.
For anyone having trouble with accessing the multiplayer sectors, download and downgrade to flash 9.0.115.0 at http://www.oldapps.com/Macromedia_Flash_Player.htm
From my experience I couldn't get IE to downgrade so use Firefox.
 "Santa Rockstar: Metal Xmas 3"){kind=icon}
 "SandStorm Racing"){kind=icon}
 "Epic war"){kind=icon}
 "The Last Canopy"){kind=icon}
 "Drone Wars"){kind=icon}
 "MARDEK RPG: Chapter 1"){kind=icon}
 "Starfighter: Disputed Galaxy"){kind=icon}
 "You Have To Burn The Rope"){kind=icon}
 "Deothello"){kind=icon}