
Coolhhhwip - there you go. Skill wise, max bloodhound and try to get the one up left of bloodhound maxed also. the second tower is for swarm waves - make sure there is another tower there.
You'll notice I haven't used my wild - yes it's a little easier for me, because of some of my skills - but I did this at a fairly low level the first run through without any problems.
You will have difficulties with finishing it without an enemy reaching your orb - don't worry about it, and make sure you have some mana spared. later waves are quite easy.