Pretty good puzzle game :) I wasnt sure why there was a three stars rating until I read your note about some levels that don't recognize when they are finished - because most of the levels pretty much felt like they were designed to only be solvable using all tiles and did not finish before all tiles were used. Well done, anyways!
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Yeah the game is procedurally generated. The majority of the time there is only one solution, but occasionally it can generate a puzzle where you can completed it without visiting all the tiles. For this reason I added the star system and a restart button if you want to retry and use all the tiles.
Thank you for playing! :)