This seems like the best choice. Speaking of which, I really need to pick up Dokuro sometime. Maybe during the winter Vita drought...Dokuro + Sound Shapes. It's only $5 more. I own escape plan and it's not bad, but Dokuro, SS and/or the minis are far superior.
But check some videos first, Dokuro and SS are not for everyone. Especially if for you "platformer" means "mario-like".
Edit: Top of page, buy Gravity Rush and New Little King's Story.