Well, I really loved the first one (apart from being too short). I would've been content with just an expansion with the old mechanics and fluids.
Shooter 2 however tries really hard to come up with new stuff and more often than not gets it totally wrong
First world introduces you to the "Hungry suit" and turns the game into a boulder-dash, you move between invisible squares and more importantly you cant stop except if facing a wall. Gives you lots of annoying deaths if you missed the opportunity to [strike]stop[/strike] change direction and your ship travels the whole invisible block to its doom. A far cry from the otherwise smooth and responsive controls.
Second world is largely ok, brings back some of the more memorable fluids and a new suit (I think, not sure). end boss totally sucks though, watch a too long cinematic, fight a bit (or rather dodge), another cinematic, fight and dodge more - die and having to watch everything again. And you
will die.
Third world intros a new mechanic (darkness and creatures that dwell in it) and this is where I stopped playing. Its just too much trial and error and running into things I dint see.
Focus is now totally on combat, fluids and interaction take a backseat, enemies will regulary spam bullets and in many situations I havent found the right way to approach them - some bullets even ricochet of walls and thats often another level of hell. Usually it works (on successive attempts) to just rush at them before they fill up the path with bullets (several of them block your shoots btw) and kill them before they kill you. If you waited or dint knew where they spawn then you will have a very hard time. the 2nd level boss is a particulary bad example, after 3-4 sequences (all drawn out with kinematics) he will shoot ricocheting bullets - easy to get hit in those small pathways and usually that means you will get hit by multiple bullets and die.
Its a bad idea to rush aswell, enemies might spawn everywhere and in some cases they spawned right before my ship (insta-death if you collide) - I cant remember this being a prob in the first part. And this is the reason I stopped in the 3rd world - as you dont see much in the darkness and the creatures there will kill you if you stay there - so fly fast without knowing where to go and remember that badly visible enemies might spawn right before you.
So in short, if you felt the first part way to easy and are downright masochistic then by all means get it!
Playing around with various old and new fluids still can be fun, but the vastly increased amount of enemies (at least after the first world) will be your main concern. At some times the game resembles the bullet-hell from the 90`arcade-shooters...
