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Towerfall: Ascension (also on Steam): Solid multiplayer game. has 4 players vs coop against brutal waves of enemies across many stages.
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Super Time Force Ultra (Also on Steam, XB1): May look like a cheap indie crap at first glance, but it's actually a solid shooter:
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Titan Souls (Also on Steam, XB1): 2D Shadow of the Colossus:
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Other games that I haven't played, but heard good things about them:
Undertale
Child of Light
Sundered
Hellblade Senua's Sacrifice *
Glaka-Z
Deception 4 *
Cosmic Star Heroine
Hob
Matterfall *
Adventure of Pip
Shadow Complex Remastered
Sexy Brutale
* Exclusives
Future titles to check:
- Etir
- Hollow Knight (Currently on PC, coming soon to Switch, PS4 / XB1 ports planned):
- Monster Boy
- Dragon Crown
- Owlboy
- Shadow of the Colossus remake