I hope you have a really big garden space! But everything is looking great!
To me it seems odd to be planting broccoli seeds and squash seeds at more or less the same time. I start broccoli seeds the end of Jan because they are cool weather stuff, that's a little bit slow growing. So it needs a good head start to be making heads before the weather gets to warm. The squash I don't plant until at least mid-April, maybe even May 1. It is very quick to sprout and grow (as I am sure you are discovering already!
), but can't be planted in the ground until the soil is well warmed up. Broccoli is the very beginning of my seed starting season and squash is the very end, the last thing I plant indoors.
But your climate is way more forgiving than mine, so hopefully it will all work out!