It is a good game, if you like first person dungeon crawlers that have a deliberately stripped down RPG experience. Lots of random encounters, no huge shortcuts.
The gimmick is the classic mode alternating to really, REALLY old school types of graphics and sounds. It's largely text based. I was happy to buy it at $30 but I really like these types of games. At $20 you might be disappointed if this isn't your thing.