We played it for a good number of levels, but having to start every dungeon with level 1 characters and equipment started to get old. The story and ending for each dungeon was quite dull as well. My son was really enjoying the game though. So we said the hell with it and got the password to play Dungeon 22. Just the last Dungeon alone took forever to get to the boss.
Yes.
One of the fun, trivial aspects of co-op is that you can see the character design/sprite of the other player in a regular basis. It sounds silly, but it adds some much needed "visual interest" to the game...and it makes the solo vs. co-op experience feel slightly different, IMHO.
My brothers and I played this back in the day, when we had the free time for the later levels. I haven't tackled the last few levels in many, many years.
The music is good, but, Jesus, if ever there was a game that needed more songs. This game really should have had a full soundtrack. As it is, it's just a tease at what could have been an utterly fantastic collection of tunes (the other titles by this developer have a unique, distinctive soundscape to them, so it is reasonable to assume that it would have been a solid effort).