I enjoyed this one, and played through all the levels. I think the coyote time required jumps is introduced a bit early. If you want coyote time to be a part of the game mechanics and not just a quality of life-thing, you might want to introduce it a bit more to the player.
I liked the jump feel, but had some issues positioning the cube precisely sometimes. Perhaps you could reduce the hitbox so you don't die if a bullet just barely touches you. I think this game would benefit from being slightly more forgiving.
I loved that the level just instantly restarted when I died.
Very well done!