Here some suggestion

--'character', 'character'
player.enter_vehicle_distance
player.healing_per_tick
player.max_health
player.mining_speed
player.running_speed

--disable map zoom-in effect
data.raw['utility-constants'].default.zoom_to_world_effect_strength = 0

--Remove the "placeable-off-grid", Flag
data.raw["land-mine"]["land-mine"].flags ={"placeable-player","placeable-enemy","player-creation","not-on-map"}

--Add not-Repairable Flag
data.raw["wall"]["stone-wall"].flags = { "placeable-neutral", "player-creation", "not-repairable"},
data.raw["gate"]["gate"].flags = { "placeable-neutral", "player-creation", "player-creation", "not-repairable"},