Personally, I don't think all too crazy. First of all, Spring Spheres sounds kind of cool. It makes me think of little glass orbs you can throw that make different seasons burst out.
But yeah. Okay, it's not like I was ever offended by the word easter egg or anything, but nor was I ever particularly attached to it.
Call it whatever you like, but, to me, Easter will always be the holiday of buying excessive amounts of chocolate ovals, just like Christmas is not ever Christ's mass, but the day of getting excessive amounts of loot.
Call it Hitlerday if you want, it's not going to change anything.