Both of you were half right.

I recommend a fist fight to choose the winner. (Or simply the first who will post).

I hereby use my right of pre-emption!

Derry and Dimple Ride Again

..

Nope, just can't remember. Used to do some two-player coop with a friend years ago.

Cyberdogs?

Yes!

Blacklight Retribution

Correct! Your turn.

Right.

Thief: The Dark Project?

Die by the sword?

Timeline? A not so good game, playing like a platformer in first person - that never works very well....

Yep, thats it, your turn.

Ah, sorry, it is my turn. Next then

No takers? Might be to obscure then.

Hint #1 - If it is not clear from the graphics, it is a Amiga game, but it was also released on PC a year after the Amiga version. I think (but not hold me to this) that it was actually released as freeware on both platforms. It received fairly good reviews (from mid 60% to mid 80%)