Thanks for the feedback!
I might do more series. Water is my favorite element, and I felt that it was too weak in a mono-setting. Fire is powerful enough as a mono (Immolation, Phoenixes, then fire bolt + Fahrenheit???!), as well as Life (adrenaline Frogs, enough said). If anything, I might do Time next (it's not particularly weak as a mono, but I'd like to expand more on time manipulation
). I'm still trying to figure out what Air is based around. It seems to me that it's just a duo element (similar to water, sort of) - if I can figure out what theme to work towards, I could improve it a little more in Mono.