I don't know who most of these studios are - Zombie Studios, Overkill, Just add water...??
As well as the Gravity Crash games, Just Add Water (JAW) have been making all the updates to the Oddworld games.
If you've played Stranger's Wrath on PS3 or Vita, you'll know they're top developers. The games are rock solid. They recently had an interview with Eurogamer on how they managed to achieve the great Vita port.
http://www.eurogamer.net/articles/digitalfoundry-oddworld-vs-playstation-vita