That was fun! I just played up until Level 5 with my wife on the other half of the keyboard. We both enjoyed the puzzles and cheered each other on when it was time to execute a move.
As a puzzle platformer, this game depends heavily on precise controls, so it was a little frustrating to have the characters unintentionally slide off of platforms because the jump button wasn’t pressed in time.
One way that you might improve the movement is by implementing “coyote time” which allows the player to travel a few steps beyond the edge of the platform before falling. Here is a clip about how “coyote time” works in Celeste.