This was fun. The puzzles generally progressed well, though the portal was first used on level 9 with no instructions, followed by level 10 teaching you about them. Their use was intuitive enough, but with the instructions being on the following level, and all other mechanics being introduced with instructions, this stood out. These should probably be reversed. Levels 11 and 12 are the same level "Eat and Travel". While verifying this I noticed that the level select has the wrong names, with each being one off. Selecting level #1 loads a level with the title for #2, and so on. I've played through #16 "One Way Floor", and may play more later.
I've only taken a quick look at the level creator so far. It looks fairly intuitive, and is a nice touch. From the level editor I was able to exit back to the main screen to play the game, but I did not see an option to go from the main game back to the screen where you can select the level editor.