Played this game for awhile now, and heres what i think...
Cell stage - To short and it looks to werid
Creature stage - I thought this was the main part of the game when i first started, freakin loved this stage.
Tribal stage - Took to long for how boring it was.
Cib stage - Took to long just like the tribal stage, seemed like a waist of time
Space stage - omg this is huge ive started killing the grox and after 2 hours it looks like i have just dinted their giant circle of places they own... heck a dint is an exageration
I love this game, but i don't think i will play all the way through(to the point where i beat the grox) im a hardcore gamer but damn thats like... huge amounts of patience needed.