Thank you so much for this wonderful feedback !
Level 4 is the first one without platforms to catch you in case of a fall, and after that, the difficulty keeps increasing up to level 13, which is almost impossible ( it's really tough, even for me the creator, and I'm used to this style of game, since it requires pixel-perfect jumps multiple times in a row )...
I'm thrilled to see that the little details like the resume timer or the particle effects were appreciated.
I think I spent about 3 or 4 days out of the 9 refining these details and fixing bugs so I'm glad that the effort is being recognized !
PS: By the way, this save system actually caused my game to crash before I realized I wasn't using the right formats...