What are your favorite 2D platformers on the vita?

I only have La Mulana and that retro ninja game (it was free for PS plus a few months ago) on my Vita. I'm in the mood for a new platformer and can't decide which to buy first, there seems to be a good amount of them in the store. What are your favorites?

I'm open to PS1/PSP game suggestions as well since I never had those.