Love idea but is match up broken??

played and enjoyed this map alot. but than thought, wait if im zerg i can just mass lings n blink up since i have overlord.. i play toss so i asked my diamond friend to just make lings.  and seems unbalance.  zerg can just mass ling early only and use overlord to blink to high ground. make forge ffe useless for one. anyone else run into this?