I see a few options for nerfing. A mix and match of these would probably be the way to go.
- Reduce projectile lifetime
- Make projectile spells have longer recovery to allow punish and reduce amount that can be pumped out.
- Reducing projectile tracking will help but not much imo.
- Make the lightning orb special cost more gauge.
- Consider adding a mana bar to some of the more spammable skills (maybe tied with hover?)
Personally I would try no.2 (spells have longer recovery) + no.3 (Reduce tracking) + no.1 (Reduce projectile lifetime)
I think this encourages more traditional fighting game playstyles with combos and not just projectile spam.