Made for tablets
Angry Birds Space seems designed for the iPad, whereas the first game was designed for the iPhone.
Not necessarily a bad thing, just an observation. The original's levels were clutter free and simplistic; Seasons, Rio and Space have got progressively more complex, graphically speaking.
It's good fun, and marginally more of a puzzle game than the original. My main complaint is the lack of content - only two groups of levels - although I hope Rovio continue their strategy of releasing more levels for free.
It's also irksome to be presented with a third group of levels ('Danger Zone') that cost another 69p to unlock. I'd really prefer one upfront cost. Not to mention that the 'eagle' feature has also been monetised - a few eagles are gifted on completion of the golden egg levels, but they'll run out pretty quickly if you want to gain the 'feathers', and you'd need to buy more at an extortionate cost.
All considered though, it's still fun at a minimal cost.