What a cool game but what a cruel game. Was playing on hard mode too!
Music and sound design is top-notch. The animations and sounds are detailed and make the game just feel really responsive. The player controller is very polished but some oddities remain, particularly around walls. Like I can't really jump along walls, and you can get kind of hold onto the wall, not falling, without being able to jump. The dash is cool but I kept finding that it didn't work when I pressed the button- I think I wasn't timing pressing the direction correctly. Some kind of buffer or wiggle room would've alleviated this issue.
Some of the challenges required more precision than I feel the controls are suited for, as you're a bit slippery. This is particularly felt in that last ascent. Also I'd make the spike hitbox slightly shorter as it kept killing me when I was standing on ground level with it in that stair bit.
But it was a fun game, it was a complete game and I enjoyed this game til the end, with some struggle. You should be very pleased with your efforts.
(Also I'd just like to point out that this game bares a striking resemblance to this terrible game I worked on for another jam a while ago. https://grommitchio.itch.io/tefl-castle Only works on Edge of all browsers. You will be hearing from my lawyers shortly)