Question 1: What was the maximum level you reached during Alpha?
Answer 1: 29
Question 2: What level did you have the most trouble with leveling above or did leveling become more difficult?
Answer 2: 28, when I have to grind 80% of my experience bar. With completely broken PvP, and nothing much else to do but grind. That was horrible.
Question 3: What are about a few "important" levels that really opened the game up or had really interesting content?
Answer 1: 1-15 levels. When it felt that Arkana was talking to me, she joked around and flirted, it was funny and it was interesting to see the rest of the dialogs. But after 15 lvl, she stopped to talk with me and almost did not talked to others NPC. So quests turned in to another "go kill" or "go fetch, but still kill" crap.
Question 4: If you ever made an alternate character, at what level did you stop leveling them up at?
Answer 4: Made and tried every class, 5 alternate characters. Stopped at lvl 15. Since it is when you get your second body armor and finish visible magic armor set. Plus at that level you get the first impression about the class in overall gameplay.