The art style is just wonderful, a beautiful blend of pixel art + illustrations like you'd find in a book. How did you create the non-pixel art? (If you're comfortable sharing!) The portrait style for the enemies was truly charming and even humorous. Had to choose the wizard because of his hat's swagger and presence.
Music/sounds would've added a lot to the game! I can understand if you wanted to make your own but didn't have the time. Those are often the last things I add, so I usually turn toward free resources, especially in a time crunch.
I had no idea what to do at first, then I figured out I had to click the monster portrait to send them at the enemy. Maybe some direction in a tutorial screen would've been helpful for that!