As others have said, the game needs a lot of polish. Playing as tank, it's very hard to get in range to attack the enemies because their attacks are instantaneous and without warning. It makes it feel like a lot of damage is unavoidable.
Another minor criticism I have is the intro should not pass automatically, I think. Let me read at my own pace and click or press a button when I'm ready to play!
Still, I like the fact that the rooms aren't too cluttered and the enemy spawns are well paced.
Wishing you the best with the rest of the development!