Which is handy, because StealthBastard immediately reminded me of the highly entertaining, unofficial 2D Portal - although it is prettier and more varied.
If you are looking for an even more evocative comparison, it might be worth playing the free, non-deluxe version, called simply StealthBastard, which can be downloaded for PC here.
StealthBastard Deluxe glories in one of the best titles of the year (although its subtitle - Total Espionage Arsehole - risks overegging the pudding), but it seems at first inaccurate.