VR Defender Y3K - Tower Defense

Play Here: VR Defenser Y3K
This is a very difficult flash tower defense. It took me several attempts to defeat the easy level. I found that the Lightning Tower and Light Tower combination works pretty good. Selling your weak towers in order to upgrade is also a vital part of the game.
I would like to think the Void Tower, Lightning Tower and Ice Cannon is a solid combo but I can’t seem to make it work all that well. Maybe if I build fewer Ice and Lightning and focus more on the damage towers…
Has anyone been able to defeat the ‘Impossible’ level?
