How can I incorporate multiple engagement types, like attack and puzzle, to enhance a simple 3D game experience?

Based on the initial baselines for a single-player game with minimal level design and varied user engagements like attack and puzzle mechanics, what are some concepts or gameplay loops that could provide a seamless but engaging experience? I’m looking for ideas that make the game feel fresh and original while keeping the scope manageable.”

How about a maze with pills scattered around on the ground and the player has to collect them all while avoiding spooky ghosts…