I've played D&D Wizards for over 40 years. And though I enjoyed the cheese, they should not be able to learn Clerics spells. Speaking of cheese, there is a certain item that gives a player an 18 Intelligence. I would suggest making that a +2. I played a Gith Wizard, who at 4th level ended up with an 18 Strength, 16 Constitution, 18 (10) Intelligence, 10 Dexterity, 12 Wisdom, and a 10 Charisma. That really helped my skill rolls. Should have some weaknesses.

Arcane Ward should be made to stack with temporary hit points, and ward points equal to 2x level + Intelligence modifier bonus. As it is now, there is no reason to play an Abjurer over an Evoker. Sculpt Spells works with Thunderwave, but never worked with Shatter in my playthrough.