As for the archer, there's not much to say. It's very simple. You can clear the first wave quickly and then go kill the Deer King to get the Lama clothes. Clear a round of crabs, and after that, it's pretty much the same, but you'll defeat the boss much earlier than melee classes. It's too simple, so I won't elaborate on the process.
I've never had the desire to solo with a mage... I have played with others though, and mages are top-notch at killing bosses. It's even more enjoyable than some people who like to use bows to burst the boss's rear end. Turn into a sheep and beat them up...
Although it may be disrespectful to the author, I have to say that this initial test version is a bit disappointing. It has shattered the beautiful dreams of many who wished to solo. I hope some expert-level players can solo it so I can learn from them. In the revised version, I usually make it to the final boss before dying...
But in the initial test version, my heart was broken. I feel that the late game in the initial test version is the hardest, purely relying on luck.