49. There's not just ennemies !!!
To make a good level, don't just put a lot of ennemies ! Try to invent some new things that doesn't exist in the original game, like some structure with the tileset. The events are really cool to use, you can get inspiration from the Training level, there's some good ideas in it ! And be creative ! Reggie let's you do more things than in the original game, there's a lot of "unused" things in the game, you can test these things and see if it's good to place in a level. And do not be shy or affraid to put some new textures in the Textures folder or to try some new logo or things like that. If, like me, you work on a new game like the soooooooo good "Another Super Mario Bros. Wii" of Skawo, try to modify the game as much as possible, not just the levels !!!
I'm french... And I'm learning english !