The overhead map is useful as is, but simply highlighting the clickable areas to 'walk' to might be more simplified and standardized for most people who tend towards visual novels. One of the areas in particular that I currently find flustrating is the forest. It could be useful in the future for multiple event locations, but I can't be sure if I'm hitting the correct spot for any event without highlighting.
It's not that I'm suggesting to not experiment, you might hit on something interesting. I've found a number of elements that you've done differently than I've found elsewhere that has gave the game a unique charm to it.