Well done!
This game was very good aside from a few little quirks here and there. The level cap felt somewhat limiting but at the same time I understand why it's there and I also rather enjoyed the challenge it presented for character building. Personally, I like to have limitations when building a character because if you're able to simply learn everything then the game easily becomes boring. Perhaps there can be more abilities and levels as well as greater challenges in the next game with a level cap of 20 though; it would make it feel more open ended to the other players.
Level caps aside, I did notice that fire is rather powerful but I also haven't tried any of the other trees. In fact, so far I haven't bothered specializing, and it's rather easy to beat the game using a versitle build that only uses the first three spells. I liked this because I prefer versatility over specialization.
Another quirk I had was the character's speed, he moves way too slow for this type of game, especially when the warlocks become greater in number and the game escalates into a bullet-hell shooter style. This is especially a problem when the wizard's movement becomes blocked off by a wall of projectiles and keeps me from repositioning to finish off some enemies that are about to escape. Also, warlocks have a nasty habit of firing from off screen which means projectiles may sometimes come from both the front and back. I often found myself not even bothering to dodge in most cases, because the experience from killing creatures usually outweighs trying to avoid a massive wave of spells. Also, the wizard is quite large on top of being slow which makes him relatively easier to hit.
The ability to fire backwards would also be nice because then I wouldn't have to pass through a wall of frozen enemies in order to take advantage of the chilly winds passive. Or perhaps a nice dodge maneuver that the wizard could use to tumble past hazards unharmed then he could hurdle over enemies as long as they were frozen without taking damage.This would also alleviate the previously mentioned issue with projectile walls and would help quicken the pace of the game a bit.
The final boss was way too easy, I was hoping to see it transform into a more powerful form or start using a more challenging attack pattern but it does not increase too much in difficulty. Even when it starts calling bats to distract you.
Other than those quirks and perhaps a few others, I found this game very enjoyable and I hope to see a sequel, perhaps also including other archetypes such as rouges, warriors, and archers. As well as a deeper story and generally more to see.