We pitched our great looking casual game title recently to a big portal and the feedback was that the title that we made is a popular genre(match 3) but it
has extremely tough competition..and it got rejected
so be sure to have a REALLY solid game with the
coolest eyecandy,music if you want it on the portal...another thing is to add
some kind of a game progress map showing which level u r on...and lastly give the player tonnes of rewards within short time frames of playing