Ah Starscape... what's not to love?
Space shooter? Nice.
Physics based handling? Not bad.
Upgradable ship designs? Pretty good!
Lots of semi-interesting characters with a less than vomit-inducing plot? Not great, but it could be worse.
So... what's not to love? Why's this a thumbs down vote?
Well... here's the rub: the handling on your ships is very realistic, but it's slow and clunky. I'm alright with that, normally. It requires some planning of momentum and some good piloting to be competent, and that's fine.
The problem is that the boss battles aren't designed for the controls nor the physics of the game. They assume perfect, pristine, pin-point keyboard turning in rapid order. I'm fine with that if the interface made such a realistic possibility. Unfortunately, starscape's boss battles are like waltzing into the olympics' figure skating event wearing cross country skiis.
It doesn't matter how good you are, the controls simply flat out SUCK for trying to fight the bosses, and player skill seriously only has a very small amount to do with it. Someone with godlike reflexes could theoretically get through in a few tries, but most of your boss battles involve being expected to start moving out of the way before a boss even begins to box you in, without knowing when or where that attack will come from. If your ship were even remotely possible to be set up to cope with that, great, but it's not.
Keyboard turning and physics-based thrust maneuvering simply doesn't work for the style of bosses that Starscape throws at you.
The rest of the game is fun and fine, a few minor nitpicks here and there, but it's good overall... but the act-ending bosses are mandatory, and they suck HARD. I don't mean "it's difficult", I mean it in the sense of "this is one of the worst design decisions I've ever seen anyone ever make... did they even play test this to see if it was fun?".
Any fun you get from the game will be sucked dry as soon as you're stuck in a boss battle, and since the controls and interface flat out aren't up to the task of fighting the bosses, it's going to make you pull your hair out over it. I highly advise staying the hell away from Starscape just in general. Unless you're a masochist, then go right ahead.
Anyway, to stress it again, there's a difference between "difficult" and "bad design and poor UI/controls". Having a piss poor interface does not equate to "difficulty", it just equates to being BAD.
Not worth it, even if it's on sale for $1. You'll probably break a keyboard that cost more than $1, even if you don't have a history of such, and are a pretty mellow person normally. While the game has lots of really good points to it, and does a lot of stuff very well, it's flaws are gamebreaking. When you put more effort into fighting the game's interface than you do fighting the boss, the game's a bust.
Score: About 35%. It has some really good stuff, but the flaws are devastating and overpower any potential the game had.