If you have not tired super meat boy. You can buy it for $3.75 on steam till the deal runs out. And Super Meat Boy is a awesome platformer. Youtube it or some thing.
That's a warp zone in the style of IWBTG, you play as The Kid for the 3 levels of that warp zone and you unlock The Kid as a playable character if you beat them (which I managed to )
Of course, the only thing about it that can really relate to IWBTG is the difficulty, but even then this game is based on difficulty that can be overcome with practice of the controls whereas IWBTG is outright unfair.
Having said this, if you've played the flash game it's very easy to see where the rip-off notion comes from. But everything about the flash version and more has been vastly improved on in this game.
Finally finding about some of the bots that are flooding the users online - bytespider apparently is a huge offender here - ignores robots.txt and comes in from a ton of different IPs
Ghan has said he has fixed this. Monovertex please confirm this fix. This was only a problem with people that had signatures in the upper levels like not the special members but the respected members.