I beat the Spartans with a Flamer Joe maxed in the middle, a Tesla Tower maxed at the bottom and a Quake Box maxed at the top... Spent the rest on 2x Wall Upgrade, 3 Repair Men and about 5 Gunmen... Didn't have to fire a single bullet and took no damage... Could've spent the Wall Upgrade & Repair Men money elsewhere...
Reminds me of Frequency... Even the music is kinda like Freezepop... Good game but the later lvls demand a fast response that you just can't get out of a keyboard!! Fun Game 5/5!!