hugo - upgraded miners use the same energy as unupgraded - 20 minerals upgraded takes 2 energy, 20 minerals unupgraded takes 5 energy. Also, you have to think about placement - if you are going for speed, only so many will fit in a spot and eventually you must upgrade.
boombloxer - the point of the game is the second marker. the first marker is half luck on where the opponent goes and half fine placement around wherever you pick. the second, however, is the skill of the game where people win and lose.
@retka
MPDTD existed LOOOOOONG (a year and 2 months) before this did, and is full speed no pausing no waiting real time multiplayer desktop tower defense.
This steals enough from DTD to stay interesting and is good for casual timekilling. I still hate seeing DTD ripoffs. 3/5