I enjoyed what went into this. 10 flowers, ~76 deaths (it reloaded when I made an itch.io account to comment but I know it was in the 70s), and 1 rick roll.
I liked the animations and sound design/music. There are some bugs, but nothing too major. if you dash right before death, it buffers and executes the dash immediately upon respawn, which just leads to an additional death here and there mostly. If you jump right in the corner from ground, it wall jumps instead, which is a minor annoyance when I want to jump straight vertically along a wall from standing. I did find a way to work around it in gameplay though.
Last bug that I found casually was if you dash and dash again before the animation plays out, it eats your dash without executing it, which just forced me to find the correct timing window in some sections, I would say ideally buffer it and just have it execute it when the previous one is played out, or less ideally just have it not consume the dash.
I saw your reply about the wall jump being disliked, I think the reason is that it feels slippery. Maybe try to give a half second(play around with that number) of time before you start sliding down. Or buffer it so if you press jump slightly before hitting the wall it will execute immediately, just to give a larger input window before sliding begins. Maybe try a combination of both. Another thing much less necessary but might be something to try out, have sliding down be slower than just midair falling, cause the friction of the wall slows your descent is my thought train.
Difficulty wise I liked it, I have some experience with platformers like this though. I think the reason it feels too difficult to others is that the game isn't long enough for a proper difficulty curve, which is understandable as the only fix for that is to just make more so you can fit a curve in which is a time sink.
This comment got way longer than I initially planned but take that as a good thing, I feel your game is worth putting my time into giving feedback on. Overall well built, charming game with fun collectibles and exploration vibes. If you read down to the bottom can you tell me if I missed any flowers or if I got all 10.