Not quite. It sort of plays like later Avernum games...except with a far sharper difficulty curve, more complex, and plays far slower, moving more like the early Avernum games where you have to click to move, unlike Avernum 4 and beyond, where you can click somewhere and have your character dash off. Combat is like the later Avernum games, clunky, cumbersome, and lots of small numbers.
While Avernum has the mercy/insanity of a party system, you're on your own in the open world of Echelon. And while Avernum doesn't exactly hand you the lore fist over hand, you at least have some idea what you're getting into, whereas getting int Echelon II, I have no idea what's going on, especially with according to the map, the plot town being quite far away, so I have no idea how I'm going to progress especially since there aren't any goblins to grind on, and already simple creatures have got my HP critical.
Overall, I feel that Avernum wins out by being more experienced, Jeff knows what he's doing and has built a world around it.