Wow thanks a million for the detailed list, I really appreciate !
In the full version I wanted to upload the bugs were solved and I added panels to show the way to the player and when they should use the air dash. I lowered the camera zoom a bit too so you can see more platforms (especially the ones you have to let yourself fall on, so you know a bit more where you're going).
I'll take your advice for the coyote time and air-physics, though I'm still new to that so I'm not sure I'll do it right ^^
As for the walls, I used a premade tileset but maybe I could modify their colors in aseprite to make the distinction between walls and floor easier to read ? Do you think that would work ?
Finally, in terms of building the level, thanks a lot for your insight. I've never built a platformer before so I was a bit like "hmmm, let's try this and that". I have no experience at game design or anything so I think I'll try what you said.
If anything else come to your mind please write back, I'll be working on improvements on the game tomorrow !