This is a genius concept -as far as I know totally original. Some of the puzzles are really deftly made as well - a really nice mix of levels that require all your brain cells and levels where you spend ages staring at the gray blocks trying to work out an optimal path only to realise the solution is 1) obvious and 2) has been right in front of you the whole time.
Graphically this is obviously highly minimalistic, but it's striking nonetheless. The puzzles, when taken as a whole, are cool little art pieces in and of themselves. Music also very fitting aesthetically.
Not sure how long it takes to make one these levels, but a JS+HTML version of this that supports a Wordle-styled "puzzle of the day" would keep me amused for months.
Fantastic job. Best game I've rated so far.