Thank you so much for your in-depth feedback and sorry for the potentially over-punishing mechanic.
Making the character falling through platform is a really good alternative! I will think about adding these kind of platform and replace it as majority.
For the bug, I think possibly you just pass right between the reset collider and the blocking collider outside the whole map, which is definitely my fault, sorry about that! And great to hear the skip button kind of due with it!
I got a very pleasant (also painful LOL) time with Celeste and it is one of my favorite platformer, and the diagonal dash is definitely inspired by Celeste. Therefore it makes me always unable to realize the learning curve problems I have when I make this type of game because when I get used to it I would consider it will be acceptable for other player as well, but I realized that's not the truth.
I really appreciate your comments and I will do my best making games based on more feedback from playtesting instead of a majority of my own experience!
Hope we can both got some precious experience of making platformer during this jam, really happy to meet u!