I've played others of the Viking Brothers games and this one was quite good. It was a bit slow to "catch up" to the standards of the later games, but given that it's the first one, I think it's not so bad. After maybe level 8 or so I thought it just as enjoyable (if slightly different) as the others in the series. I, personally, had no issues with gameplay, lag, quality, etc.

does not run smoothly at all. i played for all of 30 seconds, and was immediately fed up. buyer's remorse, big time. beware.