Thrustburst feels pretty unique to me. I've never played a game like it before, and haven't since.
The Sentinel is another one:
In The Sentinel, the player takes the role of a Synthoid (called just "robot" in the US version), a telepathic robot who has to take control of a number of surreal, checkered landscapes of hills and valleys, by climbing from the lowest spot, where the hunt begins, to the highest platform, over which the Sentinel looms.
The Synthoid itself cannot move across the level; instead it can look around, accumulate energy by absorbing the objects that are scattered across the landscape, create stacks of boulders, generate inert Synthoid shells and transfer its consciousness from one of these clones to another.
There's also a freeware clone of The Sentinenl called
Zenith, which is very fun. it starts out easy and then gets quite chaotic. and I must admit, sometimes I jump when I get spotted by the Sentinel. it's very stressful when he's got you in his gaze.
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