That was Awesome! But a few more things to add...
Well... maybe not just A FEW.
I always loved level creators, I'm not different for this one, this one was extra awesome! But there's a few more things to add for the next version to make it so many different levels are designed in different and more creative ways. (PLEASE makes a next version) The levels you can create are only giga simple and seem to have the same "feel" for every level if you know what I mean, here's some things to add.
1: Special properties for different characters, Mario gets mushrooms and fire flowers and stars to be invincible and can run if you hold the run button, Sonic can let you increase the character speed specs higher than other characters,
2: Special properties for items, Mario ? blocks give out items, pipes which bring you down to another part of the level, doors too. Just double click the certain item in your level, specs for that specific item appear, and has things like: Does the pipe bring you down? Or, what item does the ? block give?
3: New characters! The guy from Castlevania, (uses weapons from Castlevania) Luigi, (like Mario) Donkey Kong (Throws barrels, can roll) Mega Man (Can shoot and get lots of cool weapons)
4: New items, the turnips from SMB2, doors which lead to new places, the trademark loop-de-loop from Sonic (and let him run around to loop and not just make the loop a decoration.)
5: Things which lead you to different parts of the level like I said earlier, just double-click a certain teleport item like pipes or doors and it will ask you if you want to go to a different part of the level where the pipe will lead.
6: Scrolling up and not just side to side
7: Items that lead to new places
8: Some levels you don't want to jump, some you want to fly... swim... just an addition to the specs which say if you want the level to be a flying level a level where you well... fly... though don't use the sprites that are used in the jumping levels, because Maio flying without help just looks awkward.
9: The above gave me an idea that maybe you could get a power-up such as Raccoon Mario that makes you fly in a level you could jump in also, why not?
10: Floating obsticals such as the platform in Super Mario World.
Wow! Lotso ideas eh? If you make another version, please put at least one of my ideas in there, it'd make this level creator perfect, no, literally.