Just wanted to let you know I threw together a quick level editor for making new Lsokoban levels. It's very basic and only allows you to save files not load them but I think it's more than enough to whip out a couple levels in no time flat.
Just remember to save them to /levels directory and give them the next number up. If you want to share any levels post them here and I'll include them in the future.
http://stuff.hyperpixel.net/leveleditor.zip
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Here's a new map for level 5
gamefield = {
0,1,1,1,1,0,0,0,0,1,1,1,1,0,
1,-2,-2,0,0,1,0,0,1,0,0,-2,-2,1,
1,-2,2,0,2,0,1,1,0,2,0,2,-2,1,
0,1,0,2,0,2,0,0,2,0,2,0,1,0,
0,0,1,0,0,0,0,0,0,0,0,1,0,0,
0,0,0,1,-2,0,1,1,0,-2,1,0,0,0,
0,0,0,0,1,0,-1,0,0,1,0,0,0,0,
0,0,0,0,0,1,1,1,1,0,0,0,0,0
}