Game is really cool. I enjoyed it immensely. Presentation is fantastic, from the art to the music it's pretty incredible. Lots of polish here. The katana flying through the air was extremely satisfying and the slicing up the fish felt fantastic.
I first played this on trackpad and it was very tough. (which is fair). Would highly recommend mouse for this one. But still kinda wish there was a little bit of a slow down effect you could do after kills or something. Had to be extremely methodical about when I killed the guards which was nice, but it was very difficult for me and took a lot of trial and error.
I generally had a hard time executing the moves i wanted to do quickly enough before being caught. e.g. I kill fish 1, then I want to try and hide before fish 2 comes around the corner. But my mechanical prowess just won't let me because I'm too slow to pull the katana going the other way. I'm wondering if maybe there should be a bar before the guard immediately spots you. Maybe a few more obstacles to hide behind when trying to do executions. Not sure. It'll probably come down to heavy testing to get your levels flow right, but this is a great starting point.
I think ya got a really good thing here with lots of mechanics to work with. Nice work!