Thanks for playing! Nice of you to spot some similarities with Etrian Odyssey (I even went as far as to replicate the picnic event), I wanted to have some relentless enemy chasing you in the dungeon, but I cut it due to lack of time, as well as the targeting highlight, as you pointed.
You're the second person telling me about the shake on wall, I really love it personally, but I might disable it/reduce it done in a game I want to make in the future.