Stuff I haven't seen mentioned yet - Terraria is a great port and fun game to have on Vita. Atelier Totori Plus is great if you like slower-paced JRPG's. Earth Defence Force 2017 is something you'll either love of hate (I'd recommend watching some videos of it), but if you do like it then it'll hook you in for days. Zombie Tycoon 2 is a throwaway RTS, but one you can have a lot of fun with while it lasts.
Also, although they're a lot more well known, I can't recommend these 5 games enough: Tearaway; Dangan Ronpa; WipEout 2048; Gravity Rush; LittleBigPlanet. All of them felt like perfect handheld experiences to me.
And on a final note, some games I cannot recommend at all - A-Men is rubbish, I really wanted to like it because I like Bloober Team but I just couldn't; Super Monkey Ball Banana Splitz is a really cheaply made game filled with content, most of which isn't fun; Dynasty Warriors Next is fun until you get the millionth forced touch screen battle forced on you, try waiting for 8XL instead if you're interested.







