The graphics and gameplay are great, and the fact GOG now has a decent JRPG in the vein of Final Fantasy is a bonus, maybe they should release the third game, as other reviewers rave on about it being the best version in the series.
The inclusion of Tempest 2000 made the deal for me and the arcade perfect renditions of Asteroids. Just wish they included Defender 2000, which is a small gripe of course.