Creeping Death does seem perhaps a little overpowered to me.
Frankly, I thought it was fine to begin with; it wasnt the easiest spell to use, but when used properly it was very strong.
And now it's power is MULTIPLIED. The spell just wrecks things. Seems much too strong. Particularly compared to other "big" spells; Flameout or whatever it's called costs 700 per shot but doesnt come anywhere near that level of power, and the same goes with Rock Slide and Meteor Storm, or whatever they're called (and those are unusually time consuming to get, and hard to hit things with). Heck, Creeping Death even has the piercing and sliding effects, in addition to it's monstrous damage.
I'm not finding it troublesome to use either, but then I wasnt really finding the previous version all that hard to use (had often been using it against bosses).
Having said that though, I would like to see some of the "big" spells become more useful than they are. I do like that Insect Orb got changed, though perhaps could still use a few more tweaks.
Also definitely liking the 3 new spells. So many uses for those.
Oh, and while I'm mentioning hard to use/get spells.....
.....what exactly is Dire Butterfly supposed to be for? That's the one spell where I really dont know what it's supposed to be for.