All i do is crit/chain with 1 tower 8 amplifiers on giants only. Also start with the lowest amount of mana possible so your mana multiplier levels up much much quicker.
stopped playing at 300k on hard mode. game didnt get any harder. got bored for doing the same thing for over 25 minutes. increase speed or number of objects or something further you get into the game not just slightly increase the word length. or really mess with people and just start making it random letters rather than words. now that will be a real challenge. good game overall. just the difficulty didn't scale very well the further you got in the game.
 "GemCraft Labyrinth"){kind=icon}
 "QWERTY Warriors 2"){kind=icon}