So... where to begin?
The map is playable. Definitely playable. But it lacks variations in gameplay. It's just: wait for enemies to spawn, block the archway and kill them off one by one. Plus cast the second spell on the critter when he gets near. Game events were just some more attacking and casting spells, only without allies to tank for you.
It's a single player map, so filesize shouldn't be a problem, but I don't see a single imported model. Import them for terrain, to begin with. A single player map requires an awesome terrain. Period. Then, import them for enemies. Blizzard-made models are over-used and dull.
Hero doesn't really make any sense. Concept: Far Seer with two ice spells, and two summonings. Summons fit with him more or less. But ice? I mean, it doesn't freeze them, it just does damage, so you could basically use anything, I don't get why ice. Lightning would fit better with Far Seer. Aside from concept, there are more problems. He is ranged, so what use does he have from an AoE around hero damage? Plus, it isn't the whole AoE. Plus, it deals damage over time, so you need to stay near the enemies. I liked the second one, it's great for the critter and for both events. Third is kinda simple, and kinda useless, because wolves are very weak, and you already have allies to tank for you. Ulti was good, although it takes some aiming, it does massive damage.
And now, the items. They are good, I liked that the icons fit with each other (especially on last tier :3 ), but they are too simple, basic and blizzard-made.
All in all, this can be a great map, but it just isn't at a time.
Furthermore, I would be delighted to help you with anything related to this map. Contact me if you want. +Rep and best regards from me, mate