Topic: The way to go on Defend your Castle

Because of the lack of gamefaqs and guides of DYC I was wondering if people could share what's the best way to reach lvl 40 on Defend your castle, like what to level, what to be on the lookout of and upgrade.

I've gotten to lvl 40 a lot of times without dying but I do feel I get there with less upgrades than more people. I also want to know how you level your mages, and other weapons on the game.. loke 101-51-61..... 201-101-81... etc...