I think its an interesting dynamic overall, giving one the ability to put brood(s) of Hormies right in the enemies lines early on but Im sceptical of the points.
Just because its 30 points more then its contemperies - Carni/Tervi etc dosent necessarily mean its balanced.
The fact it has fleet and bounding, as you've said means its very very fast , tough with 6 wounds and a 3+ save.
Did you use one or multiple of them? I think in isolation it might be ok but for less then 600 points you can have 3 of them all sprinting forward spawning Hormies which are very fast too.
It would mean hitting the enemy on T2 at the latest, which is quite interesting but potentially very
OP if there are several of them and thats of course before you include the rest of your army build.
A few more games to test/evaluate would be great