I enjoyed the story established in the introduction. I appreciated that you highlighted important words in the tutorial, too! It's a small thing, but it helps emphasize key mechanics. I think you did a great job making a game feel like an adaptation of a tabletop, and the combat quickly became intuitive.
I love how you combined sprites together to make the bigger characters! That made them feel much more complex than the original 16x16 would allow. The "auto-advance" button fit right in with the "tabletop" vibe, although it may have been helpful to show what objective the character was moving toward. The coloration of the tilemap definitely made it feel alien (not human), but if you had more time, I think the overworld could have used more visual interest to match the epic story you craft!
Great job overall! I lost Prince Caspian toward the end, and I immediately wanted to restart and try again using new tactics.