i just found this game in kickstarter, i came here to play it and it's awesome.
I played it 4 times until i win it once... i think i found a "bug", i made an archer build with manastone bow and the lighting arrow (the floating one... i used the conduit to give conduction to adjacent (and diagonal) structures but it didn't worked, the blue manastone isn't connected with the arrow. 
Finally i went endless but a unexpected bomb item +500% dmg destoyed all my build because i didn't readed correctly.