It's common in the industry for a game to succeed on one platform, so management predict that if it is made portable, the title will continue to do well. This is rarely the case. More commonly, games are taken from their home platform and completely reworked to scale down to the mobile interface and screen size. Sometimes this can mean that entire games are redesigned and loses sight of it's original premise or charm.
Tap My Katamari Edit
When brought over from the PS2 to the smartphone, Katamari Damacy was reimagined to the whacky physics based roller, to an idle clicking game. The complete opposite of the original title, causing many older fans to be turned off by the sequel