The music grabs my attention most as I just like that tune.
Also, one thing I would have noted in the trailer would be something like Terraria had on it's page (and still does even though it is no longer updated), which is "Free Content Updates".
Free stuff always lures people in, but I am sure you can write that in the Steam Page if you ever wanted to.
Overall, glad I heard about this game back in the AI Wars days, but only decided to buy it 3 weeks ago after decided between this or Minecraft.
Keep up the good work guys and I hope to still be playing this even when I am a Pokemon Master (my main objective in life now, even though I only have like 30 out of 600+ now).