Nice concept here, like others, it would be awesome to see it expanded into some more puzzles (except for ones that require a one block gap wall jump - good god save me from that hell)
Really love Powerpuff-style Kronii, and great work on all the custom assets in the first place!
Also like how you have the two run throughs required for the true ending, though it was a little confusing on the requirements for the second run through (had to come back to the comments cause I forgot about the hint in the description), I think it would be better to make it a little more clear in game on the fact that you can just ignore the Kronies for the second run through.
But all in all great work!