It's a great game, but it unfortunately suffers from a couple of problems, some major and some minor.
The tutorial isn't really all that helpful, it gives you an idea of what you're doing--it lets you get comfortable with the X-Shuttle itself, but what you're supposed to do is not really elaborated on.
The trading system is good, but I feel like it would be better if you were able to walk around these production centers and stuff (Although, you can do some EVA in X Tension). The music is good at setting an atmosphere, it gives you a feeling that you really are flying through space--not some high-intensity, strings-heavy Hans Zimmer ♥♥♥♥, of course, the music is well-situated when you get into a fight, but even the fighting has its own problems.
The enemy AI is awful, it's just awful. I would find more challenge if the game had them fire back or at least tail you closely, but instead they turn into giant Kamikaze-units and try to ram into you, leading to cheap deaths. You usually have to try to take them out in one pass or just make sure you're ALWAYS behind them, or approaching them in a way where they can't turn and fly into you.
The graphics are really a mixed bag. The use of low lighting and lens flare make it feel like a science-fiction title, with stars' blaring light casting through your ship. Planets are also well-drawn. But the ships and centers look very...well...I would say "1990's" if this game wasn't developed in 1999. The graphics are bland, a lot of grays, greens and reds when more life could be put in.
Ship control is great! The ship handles pretty well. There isn't too much to be said since it flies wrather swell.
As an overall verdict, the game is...decent. The ship control is good, and background graphics are good, I love the trading system and it's fun to become anything from a supply merchant, to a drug supplier, to a bounty hunter and, when you amass enough credits, entrepeneur. The game is hampered by poor enemy AI and bland graphics with ships and stations in space. But, overall, I'd recommend it.