Would be nice it we could set boards on "idle" state, where it would get its DPS, but without processing particles. When adding too many boards game starts to lag badly. Currently a second in my game is like 3 real seconds, so my real dps count is divided by 3.
Did all the game with random musics. Just know what to equip and boom, you are there. Need to do the last lvl 3 times to pass, but the other ones, some with gold weren't too much trouble. Just equip the weapon that damages everyone and focus on weap dmg.