i agree with ZivC about the respawning time for such a challenging platformer. i think you could be more forgiving to the player in general. however, the presentation is excellent and i really like the expanding levels!
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That was probably a good choice to make! However, there are certain areas where the player may try to jump beneath a low ceiling or jump into a one tile-high passage, but they fall short. You should avoid these situations in the level design, and when they do appear, try to be generous. For instance, if a player hits a wall but would have landed on top of it if they were just slightly higher, you could nudge them upward.