I've only played a few matches by here are my initial thoughts:
The Bless/Curse mechanic really make battles nutty and unpredictable. In some ways this is good but overall I think it's too powerful. I'm not sure if the arena will have separate balance tuning but I would strongly consider removing a blessed or cursed character changing environments. It's one thing for you to intentionally target an elemental surface and curse/bless it but all the characters doing so as well takes some of the player skill out of a match. Especially with how long those statuses last.
Map size and Movement:
Some of the 4 player maps play too big and lead to a lot of standing around waiting for someone to make a move. A potential fix for this could be giving each character a first round bonus movement only AP so they can get to position quicker and the round will go faster.
Delay Turn:
Consider limiting the ability to delay a turn to only once a game per character.
Source Potions:
In a lot of chests I found source potions but they really were not worth the cost in AP to get there and grab them since they only had 1 source point per potion in the ones I found. Not to mention you have to spend AP to consume the potion. I'd increase it to 2 source point potions. This is especially true considering the opportunity cost of not being able to attack that round or just going to a source pool instead.
Character Level:
In the next patch version I'd like to see a couple of level sets to see how it plays at level 4, 6, 8 instead of everyone being at 8. Even if full character creation for the arena isn't implemented yet just add some character sets like you have now but for other levels.
