Dune II - The Maker  
Nice little engine if it wasn't called "Dune 3"©.

Mount Python  
Nice too see original graphics that are still faithful to the original. I'm already addicted to it and its just a tech demo :).

Outgun  
At first sight it looks boring. But its simplicity actually makes it addictive. A must-have as a time-out game.

Zep's Dreamland  
Very well polished. Very cool idea. Very nice graphics. Overall cool.