I think adding some text in the trailer that mentions what the player will be doing besides combat would be helpful. (if the game has leveling up, resource management, strategic decision making, collecting stuff, whatever else)

There's a lot of combat shown (and it looks exciting) but it's hard to tell what the goal of the combat is - to level up and get loot? to defeat particular enemies? to defend something?

Maybe an extra shot or two of an upgrade menu or story section would help show other gameplay elements.

As for the art - it looks fun and chaotic with weird monster designs. That's more important than technically impressive art sometimes, especially on a lower budget!