This is really good. I like the title, the visuals are simple but effective, I really like the music (though the transition between the normal song and the "thinky" one could be better) and it's just really satisfying to play through. Really inspires me to work on my current game and get better. I hope you do well in the jam.
The major complaint I have is that the teleporter wouldn't work correctly for me, so some levels are probably way harder as a result. Also when I click the mouse, I expect the character to instantly transition into slow motion so I can plan my next move, but there's this cooldown that stops you from spamming it.
In theory this makes the game more skillful as you have to plan your dash usage ahead of time, but in reality it makes the game less responsive, causing a tonne of unfair deaths, at least in my opinion.
I'd seriously appreciate some proper difficulty options in a similar manner to Celeste's assist mode; removing the cooldown on dashing, gameplay speed options, making it so that spikes bounce you or reduce a life total, all that jazz.
Also I couldn't get the "skip level" cheat to work, but I realise now that you probably meant "Press the 1 and 2 keys on your number row at the same time" and not "Press mouse 1 and mouse 2 symultaniously". My bad.