I just noticed... your poison effect is working backwards. A Lvl 1 poison should deal 8% of the creep's hp, but instead, it looks closer to 92% of the creep's current hp.
One of the glaring bugs in his TD Tutorial is the fact that if you upgrade a tower all the way, it no longer shows up correctly in the info box. Another bug is the lock-on time required to start attacking a creep.
YATD (Yet Another Tower Defense) based off of Walter Reid's TD Tutorial. Your cars drive backwards and spin crazily around corners. You also don't get docked a life until the creep reaches the entry point again. It's a good start, however... Just fix the bugs that Walter's tutorial presents, and it will look nicer.
GemCraft is a great game, but I'm only rating it 2/5 because the author(s) hasn't fixed the Next Wave button bug for the entire time it was on Armor Games.
Uhh... if WamboOSX is answering about The Roundabout, ignore what he just said...
When I did that level, I didn't have to pave any of the tiles, just placed a bunch of mages, upgraded them both fire and energy. I built the four that were closest to the roundabout first, then the tiles that were between the enter/exits. I think I may have added in a hero on the center tile, but I'm not positive.
First time I've played this, and I find it to be quite slow. Also very hard to select tiles that are either behind a character, or behind a higher level.
I'd rate this a 1 because it keeps pausing on me every second, but that's because of the new chat system having to reupdate the list of chatters every second.