Plants, seeds, are kind of programmed to grow in the spring, with longer days, hey? I believe you're doing fine. First thing you know it, you'll be needing space for pots! Then bigger pots!
Ha, a girl posted in the Adenium group on facebook a photo of a tray, like a kitty litter pan, with what looked like several hundred seedlings, no joke. They were about 1mm apart, really jammed together. Some were damping off. Then someone commented about pots for all of them. She said, "Pots? I hadn't thought about pots..."