I think that anyone that has played either WoW or RS should try the other, they are very different experiences. For example: in RS you click on an enemy and wait until it dies, while in WoW you move around and cast spells, with comletely different strategy for PVP and PVE, but RS has 30+ skills that each take as long to max out as it does to max out WoW combat and professions put together. WoW is much more social, while RS has quests that are puzzling and much more in depth than "get quest-kill monster-return to quest giver". RS also has some pretty fancy minigames.
Wow, surprise ending, don't see that very often. I was actually surprised. The comment with the walkthrough fell to th enext page so here it is again: http://armorgames.com/walkthrough/192
Level 1: Up is good
Level 2: If you stay on the far right, you will need to dodge 0-3 blocks the whole time. The rest of the time you can rave to the music or somethnig.
Level 3: Stay on the very top and leap aside when necessary so you don't confuse yourself.
Level 4: Dodge his attacks (jumping over him when necessary) until he stops moving, then jump on him (quickly or he will wake back up).
The AI is cheating, I had 4 ion rays set up and was destroying everything without giving it any $, it was still making units (I eventually won with 2 simultaneous super soldiers).