Hi,
You should make the sword and dash activate on button push, not button release as it is now.
The diagonal dashing seemed akward, at lest on the tiny platforms with release button to dash. Sometimes you are on a tiny platform from where you have to diagonal dash, but there is almost no room to start walking diagonal + press and release the dash, it felt way too precise. I would do away with the diagonal dashing, at least if there is no way to line it up while standing still.
There was also a platform where a skeleton was waiting for me so it was basiaclly impossible to dash over there without him killing me. Shift to dash is also awkward due to the "sticky keys" popup on windows. I died by falling but the enemies did not. I somehow became invincible at one point, which was nice because I got to see the boss witch was very very cool, he was easily the best part of the game. Intro story and cutscenes are very nice. Camera panning to the doors I unlocked was very nice. Music was good although there was some uncomfortable total silence when the track was going to repeat.
Very cool boss!!