Kiai Resonance is a 2D fighting game that focuses on timing and stance adjusts. My first thought was that it reminds me of Nidhogg but it's much more focused on the duel. You can't jump, you can't roll, you can't run away, that wouldn't be the bushido way. You attack or die.

I'll let the devs sum it up:

You take part in multiplayer samurai combats where one hit off-guard is fatal, and several challenges to perfect your skills. The player can change his katana position at any time to adjust to his opponent's, creating a mind game where you have to anticipate his next attack.

Among the available game modes are included the classic one vs. one, either alone against the AI, two on the same screen, or online, as well as various mini games to test our samurai skills.

I love the little mini games. The game recently came out on their website and at itch.io. I haven't been able to try out the multiplayer yet (couldn't find a match). This is a game begging for some dedicated players to play online. I'm hoping it gets more popular (that's why I'm talking about it). It's available for $4.99 and honestly it was a no-brainer for me at that price. It's a delightful little game well worth that asking price.