Destructoid:
Sometimes you just want to slash people in half and use no more than a couple buttons to do it. Reminiscent of games like Strider, Ninja Gaiden, and Shatterhand, Oniken is a brutal and brutally difficult 8-bit platformer that isn’t for the meek.
Richard writes: "This is a solid and really engaging hardcore retro throwback, and so if you're looking for a blast to the past, you'll feel like a kid again playing Oniken."
Shaun M Jooste writes: "Nintendo Switch version patch also brings TV filter and screen size options, bug fixes and more."
John Williamson from TPG writes:
"Oniken is a terrifyingly difficult action platformer which beautifully honours games from the NES era. If you are glutton for punishment, or simply enjoy retro inspired games, Oniken is a must-buy."