I can sum the entire Spore game up in 6 words "Kill things or dance with them".
No seriously, that is the entire game.
First phase plays like Flow, carnivores eat things, herbivores eat plants. You grow bigger and eat bigger things.
Second phase plays like a very, very basic MMORPG. Carnivores go around killing and eating things to gain exp, herbivores go around dancing with things to earn exp.
Third (tribal) phase plays like "My first RPS" and was proaably designed for 2 year olds to play. It has no depth at all, no units, resource mangement, planning out your base or anything. You make as many unit as possible (6, then 9 and then 12), then either kill things if you are a carnivore, or dance with them if you're a herbivore. This stage literally took me about 10 minutes to do.
Fourth (civilization stage) is basically the tribal stage, only with robots and cities. Make as many robots as possible, and then go around either killing everything, or dancing with it.
Final stage is the space stage, and would you believe it, you either go around killing things (carnivores) or making friends with them (herbivores). This stage contains a little more depth than the others, but the depth is wasted on collecting silly little extras basically (now your planet can have pink water instead of blue water!!!).
This game basically sucks. If you enjoyed playing the Sims you might enjoy this game, otherwise you might play through it once (as the game as absolutely no replay value at all), which will take 3-4 hours at max, then you'll be bored of it and probably never play it again.