You defenetly did something there, this games movement can be mastered to a high degree, I can tell even though I only played for a few minutes. But there are also a lot of bugs, my encounters so far were:
-getting stuck in corners
-dash and/or jump beeing entirely disabled
both could be resolved by getting off the ground (falling off a ledge, using a jump pad or jumping if possible)
so I would guess that the player can clip into the terrain due to having slightly changing hitboxes throughout diffrent animations, hope this helps, keep going, the game is on a good way from what I can tell.
Edit:
Also add fastfalling