I really like the art style on this take of Mario Maker.  It's got a nice pirate theme.  The starfish looks a lot like Patrick from Sponegebob Squarepants :)  Level editors are truly difficult to build - I've built one myself for a game in the pre-Unreal days.  It has enough building blocks and size to truly build some unique and interesting levels.  This was a great idea for a game dev level design challenge.  There is one bug I found that not sure if it is actually a feature: If you jump into the moving platforms you will sometimes be launched backwards at a decent speed.