Wow, I must say, this is pretty impressive. I did not read the whole thing, however. If you teach how to write in flash and Javascript, that would really show that you want people to make games.
For the Robot Mangler Arena Boss, 2 second cooldown time for Ion Cannon is way too short. If it will have a 20% stun, it should be longer. Either that, or have it at 2 seconds but remove the stun.
Finally realized why playing as a Psionic is almost impossible. Charge times for the casts are almost 1.5 times longer than the other classes, the attacks are weaker, the cooldown time for each is an average of 1.5 seconds longer than other classes, and you recharge 3 mana per second but the skills cost around 1/4 of your overall mana, leaving you with only your weapon attack while you wait for your mana to never recharge fast enough.
Arena Smackdown
Dude! You just completed the Arena Smackdown achievement in Talesworth Arena: Death Watch and won the Arena Smackdown badge and 30 points!
Almost impossible, but good concept. Just adjust a few values.
Just as EldrichCataclysm said, there are just too many situations where it is impossible to avoid damage. I understand that it is supposed to be very hard, but that type of difficulty is not needed. Just increase the spacing a little so it is possible to last more than 20 seconds after a "continue game".
Thank you for changing the AI and the tank damage. I have noticed that the game is a lot more fair now. Due to the changes, I will change my rank as I promised I would.