Welcome back! And no, don't climb up the ladder. There is no ladder. Once you reach high enough (although so far, no one has), you realise that, then fall to your death like those cartoon characters (well, they never die but you, being a human, will certainly do...well, maybe not, since human beings don't climb up invisible ladders...I've lost track now).

Yeah, yeah, also check out the Jazz Sprite Editor in the link given to you and don't forget to upload your levels.