Alright, some thoughts:
Lightning chain: clean, simple-to-use and a pretty neat concept. Seems to stretch the boundaries of the contest theme, but I still thoroughly approve of the job you did.
Mana Share: Neat if simple spell. It's not even close to multi-instancibility though, and your test map doesn't actually include a unit that can cast it (unless I missed something).
Hive Mind: Kind of hard to use, but very cool all the same. I wish duration was a little longer, so you could use it better in the test map.
Sonic Infection: Neat, if slightly simple effect and distinctly laggy map.
Unholy mirror link: Awesome concept, but the map doesn't even start - what gives?
Inner Strength: I don't think it does what you think it does... The test map, at any rate, doesn't seem to work in any designed way. Actually, upon looking at the triggers, I see how this is supposed to work. It's pretty neat, but your map doesn't display it very well.
Battle fury: I guess I see what you were trying to do here, but for whatever reason it never activated (at least not obviously) in the test map. Ah well... Strange.
Spell Inflection: Well, neat concept, but I don't see it working in the test map... Huh.
Now, note, it's possible that all this failure to work is something on my end. Maybe I'm not understanding your spells, or my WC3 copy is somehow corrupted, or some such thing. Those, however, are my earnest thoughts. Take or leave them as you please.