I should admit it is quite hard to find a good game that has been awarded an impossible badge on this website. This game's songs are too long and they are not properly synchronized with the notes on the screen. At least it is a thousand times better than DJManiax.
Floaty controls, in a way worse than MoneySeize's. Lagged button response, fast acceleration, and slow decceleration—the perfect recipe for floatiness. Combined with unclear hitboxes and some element of luck, the result is a game unfit to be honored by an Impossible badge. Happily, the badge is easier than many Hard badges.
Fourteen minutes ago, MoneySeize's impossible badge was conquered by me. Having fond memories of Streamline, and having never been able to overcome its impossible challenge as a teenager (from 2007 through 2011), I find myself surprised to beat it on my second try.
Success has been achieved. After about twelve hours of gameplay across two afternoons, and the help of a guide to find some secret rooms, all coins have been collected. I've known this game since 2009 and could never find the patience and skill to beat it. Now I am 24 years old and my cognitive skills have developed enough to allow me to master this game. Extreme victory!
 "Super Crazy Guitar Maniac Deluxe 3"){kind=icon}
 "Vector Runner"){kind=icon}
 "Streamline"){kind=icon}
 "MoneySeize"){kind=icon}