what kinda soil do you got it in now? looks like mostly wood chips
try to get some fox farm soil if you can, or some black gold, or if you cant get your hands on any of that miracle grow will work but i wouldnt reccomend it, its really easy to burn your plants with that stuff
and when you transplant them, bury the stems a little bit
or if i were you i would just start all over without the foil and better soil, trust me you may lose two weeks, but it will be WELL worth it, cuz you could have a much better plant in 2 weeks if you revise your strategy
instead of foil use emergancy blanket... you can get it in the outdoor section of your local walmart or kmart or target or whatever and there like 1 dollar