Like what I'm seeing thus far. Art is good and gameplay is functional (if a bit grindy).
Looking forward to some new sizes (bigger is always better, after all). Just a small nitpick of mine, but the size difference between 2 & 3 storage is a bit too big. However, since I don't know just how large you plan to go, it's most likely a non-issue.
Will the different mana types have different effects later on? Blue has no effect as you said, but I'm not entirely sure what the others are supposed to do. Also, do you plan on implementing different interactions between the mana types if you were to mix them? There's a lot that can happen with just 3 mana types ;)
Anyway, great work thus far. I'll be watching your career with great interest.