As a Gauntlet lookalike with knobs on, Demon Stalkers isn't too much to write home about, particularly as the graphics and sound are nothing special. But as a DIY Gauntlet construction set which happens to have a 100-level game as a bonus, it's got to be good value.
The graphics are excellent... The movement and scrolling is smooth... And this is a big game with a great deal of various objectives to keep in mind (shooting bolts, finding and casting spells, controlling elementals, trying to find Acamantor's hideout). Keep your wits about you!
The coin-op was actually nothing special, and its popularity was more down to, what was at the time, the fairly unique simultaneous two-player action, as opposed to any dazzling gameplay elements. This conversion is just as playable, for the same reason.