I dunno, never had the lite version. I just happened to be browsing through the app store on the day they were offering the full version for free, so I thought I'd try it.

It kinda reminds me of Predators, but that uses buttons instead (if I remember correctly) and is much darker. That's a cool game too, but what stands out in this one is the controls. Plus, have you learned about perks and skills yet? Between those and bonuses, you can have so much fun. The only thing is I wish you could always see your enemies' hp bars, not just when you have the "observation" perk. Hard to defeat bosses when you can't even tell how much hp they have and how much you're taking off from them (if any).
And they made the best weapons have high upgrade prices (possibly in the hopes that some people will buy gold), but it just gives you something to work for. And gold is easy enough to come by when you hunt.