Nidhogg will allow cross-play between 2 platforms

Nidhogg
Crossplay platforms
Release Date: Jan 13, 2014
Official Website: Link
Crossplay platforms:
Nidhogg will support cross-play across multiple platforms. It will be possible to play together with your friends on Playstation 4 and Playstation Vita. Please check out all the details on the game's official website!
Summary:
Nidhogg is the award-winning fencing tug-of-war, full of graceful acrobatics and clumsy stabs. This is the ultimate two-player showdown of fast-paced fencing and melee attacks. Beware, advantages in Nidhogg are often fleeting, as new opponents continually spawn in your way. Use a variety of fencing maneuvers while armed -- lunges, parries, and even dirty tricks like throwing your sword. If swordless, press forward with punches, sweep kicks, dive kicks, rolls, and wall jumps.

Screenshots:
Supported game modes:
  • Single player
  • Multiplayer
Supported player perspectives:
  • Side view