I love the art style! The platforming is very satisfying, too. One of my biggest issues was with the size of the hitboxes for obstacles. Many of the hitboxes for spikes and clouds seem to be significantly larger than the visible object. The smaller clusters of red spikes were completely unclear whether you could go through them or not. Like others have said, the dropping boulders (and to a much lesser extent, the lasers) felt like very cheap "gotchas" since they would often drop while you were midair and the warning for them appeared far too late to be useful.
Magical Girl Game Jam #14 » Entries » I was reincarnated into a magical world, but I made a pact with a succubus and am now in hell.
I actually made custom collision shapes for each level so that they are smaller than usual, but one thing I couldn't solve before sumbission was that even old puffs of fire would still have a collision shape, despite being transparent in some areas, and that collision shape also often was still a bit large, so definitely could be improved there. Thanks for the feedback and hope you had fun!