[quote name='DarkNessBear']But, I'm considering just buying the $10 creator and not playing the trial. Will this spoil Spore?[/quote]
No...this isn't a game as much as it is just a set of tools for creating a creature, just as the title would imply. There isn't any actual gameplay. You can use a wide array of options to design your creature then have it do a series of poses and emotes. Also, you can take pictures of your creations and also create animated gifs and video clips all within the program itself.
It's really just a teaser application, but a really good one.