Awesome game! Took a while with Level 4, but finally got though it! I did beat all the levels! Great job!
A bit of feedback on the last spinning obstacle on Level 4: Is it possible to make the openings have a bit more lighting (either artifical or with the lamps from the level itself)? It took me a bit to finally realize through a the darkness that there was a hallway hole to utilize (partly because it took a while to get over there).
A bit of feedback on the Katanta Aiming mechnics: I noticed that we can't swing unless we are angled over 91-ish degress away from a wall. Maybe you could make the white line turn red or make the opacity of the white line diminish when you can't swing at certain angles?
(Also, I failed at the start of level 4 when trying to swing at a 90 degree angle a few times and "broke the katana" without it actually being broken). Might be a small one-time bug (maybe the game thought I clipped through the wall), but that now makes me curious on future mechanics if this game goes furter into development!
I, also, noticed that the Mouse Wheel let's us swing without clicking! Pretty cool to quick slash and speedrunning, but tough without having the aim line to visually assist.