Finally did the whole game my tips:
1) dont spend crystals, only craft legendary when u dont see a way to progress, highest ilvl is 999. 2) gold farming is useless, try to get items they sell much better 3) Best combo: laser + lightning 4) 1 extra ship weapon slot by compleating 50 lvls on survival 5) only get high lvl items with + to hero dmg 6) when u reach lvl 50 skills get useless, invest your points in +% hero dmg and more/better items
 "Clicker Heroes"){kind=icon}
 "Sky Quest"){kind=icon}
 "AdVenture Capitalist"){kind=icon}
 "Idle Necromancer"){kind=icon}
 "Kick The Critter"){kind=icon}