ok so, on the itch page, the white bits around the border feel weird, but the rest is nice - plenty of gifs/screenshots and a long description
in game, the (menu) music feels a bit "noisy" (as in white noise), kinda weird
it also stops when you open the credits menu
the unstyled buttons also don't look that great, doesn't really fit the vibe
launching the game, the first thing i notice is that there's little to no acceleration and no physics interpolation, which amkes the movement "jittery"
the jump feels very floaty in general, and, as you mentioned, adding coyote time (and jump buffering) would help the feel a lot
it also feels like the directional inputs are sort of.. delayed when you turn around, which makes the player feel kinda slippery, while also being able to start moving relatively quickly from a standstill which is kinda weird
ok now i get teleported to another level, where the camera is for some reason following me differently?
i'm not a huge fan of the level design, the boxes completely stop your momentum which feels pretty annoying and there are some small ledges you have to jump off of which, without coyote time, is really annoying to do
the jump sound also gets a bit annoying after a while
it's also kind of annoying that the breakable walls just stop your momentum instead of letting you breeze through them at high speed
the level design also feels frustrating and kind of unfair sometimes, especially when being sent back to a previous part, which becomes boring pretty quickly having to replay the same part over and over again, so, unless you want this to be a rage game, you should probably rethink that
however, i do think the idea has some potential - it's pretty fun to gain a lot of speed and just breeze through the level and the floaty, but controllable jumps add to that feel and i think you can make it really fun to play!
overall though, don't be discouraged, criticism just means you've got more room to improve!