Growing plants from seeds; first setback, what should I do?

So I used one of those Jiffy mini-greenhouses to start seeds about one and a half weeks ago. Zinnias and some Purple Millet were the first to sprout. And today, temps hit around 90, and when I got home, those seedlings were yellow and wilted. Guess they were just overwhelmed completely. I fear I not only lost them, but the many with longer germination time as well. Am I completely "screwed"? Advice? I've already removed the lid and moved the entire tray to the side of the house that only gets partial day's sun, as opposed to full a full day where they were. Will the other seeds be okay; do I start all over? I think I just nearly experienced what it's like to be heartbroken, because I am worried I'll have nothing to show for my work... and have a lot of dirt in my yard this summer. Advice, thoughts, etc. would be most appreciated.

Growing plants from seeds; first setback, what should I do?
yeah sound like they got to much sun .i would wait a week to see if any new seeds sprout if not .its back to the store to start all over sorry hope u do better next time
Reply:Don't worry you can try again. Suggestion, grow them indoors when the weather is suppose to get that hot (Baring you have AC?). Keep the mini Green house in a room that gets lots of natural light but cool temps NOTHING over 70. Water as needed only! Too much water can kill as easy as Baking. Then if and when the temps cool down some slowly get them use to the outdoors a half hour at a time couple times aday if possible; until they can care for themselves on their own. If you still want some good show flowers buy some perennials that come back every just to fill in spots.
Reply:I have never used a mini greenhouse to plant gerneral flower seeds, I have always planted them and left them outside. I think you may have killed them with too much humidity and not enough air. They need the air circulation or they die from molds. I think you baked them. Start over, Zinnias start in about three days, and come up easy. Don't give up see what the other do before throwing away the soil. If you weather is settled you may plant them in open run. They Cosomos, try nasturums, and Straw flowers, a few Sun flowers would also be fun. Marigold are also easy, just scratch up your soil, and broadcast the seed, and the final touch would be a seed cover, a soil mixture made for this purpose. Water in and until they all grerminate keep the soil moist, don't let them dry out. May you have a beautiful garden with lots of flowers to cut for your home. Hoyakins.