Hmm... I was five, around the year 2005, and at the time got a red, blue, and white visorak. I remember once i built them all together, that i wanted to know where these spider things came from, leading me to become a fan of the series.
I thought about this for awhile too. I thought that the game would take place on Spherus Magna with different biomes to explore with the ability to choose between being either Agori or Matoran race, and steadily gaining protodermis and leveling up until you evolve into a Glatorian or Toa.