Straight Forward
Not perfect, but I will admit, you've come a long way. First off, the good parts:
Pros:
1. Enemies
2. Unlimited Space
3. Variables
4. Health
5. Finish Line (Well, door, but same concept)
6. Fully Customable
7. Zoom
Now, to the bad part :( :
1. Lag (Try making something like boxes the have a dotted line, and these boxes load only that section of the map at a time, and in edit mode, show the box you're in and all of the ajecent boxes as well.)
2. Specific Colors (Try a color wheel instead of specific colors)
3. No stats (Try creating some like "jump height", "walking speed", "double jump" (Y/N) "flying" <<< if so, "flying time" and "flying speed". Again, make these sliders not buttons thus making the game more professional like.
4. HUD Problems (Try breaking down the HUD by doing something like having sliders on each side of the screen that once pressed, button that are similar (Like all objects in one slide). Also, try displaying a small box in the bottom left, or right hand corner that comes up, and shows things like, preferences. (You know, like the whole "jump height" stuff listed above.
5. Pen size (Don't shrink it, make the shrinkage adjust able
6. Undo (Some I make a single mark, don't want it, but there's no way to fix it. Make an eraser or something)
7. Enemies (Be able to change their attack power, walking speed, and health for starters. Also make their main greenish color adjustable, or have other kinds of enemies to select from)
8. Power-Ups (Power-Ups are handy, increasing health, refilling health, increase attack, defence, and speed, and maybe even jump height.)
9. Items/Equipment (Make weapons pick-upable)
10.Special Items (Things like Springs, Warp Spots, Locks and Keys, etc.)
11. Environment (Try making something like water that you can swim, and drown in if you swim to long. Also try lava that makes you run across it really fast while your health bar depletes. You could even go for poisonous clouds.)
12. The "premade box" (Yay. It's adjustable, too bad I can't make a tall skinny column. Fix it.)
13. Give the hero more options. (Look into the "Create a hero" Series
Sorry about the nagging, don't go all "Well why don't you do it!!!" I barely have enough motivation to finish the sequel to my first flash... Well, you've done far more than I could do, but it's not the best on Newgrounds... but, it does have the potential to be the best.
Okay, let's see here... 7 Pros, and 9 Cons that bug me, subtract to get -2 add that to ten, and you get an 8! And a 4/5!