I had a lot of fun with this! I like that the only hints are in the level names. and everything else is left for discovery. Level 3 was the toughest for me, but after finally solving it the rest of the game just clicked for me, I'd suggest making the grid size for level 3 smaller to let the player be able to accidentally solve it, but still learn from it. The last level did a great job of throwing all the concepts together and having them interact.
Good Job!