Dynamic weather Rain - floods tunnels/temporary puddles to swim. Wind - affects projectiles and flying creatures
Vertical layering? Expand digging mechanics for burrowing etc.
Squirrel invasions? Bird attacks etc
Micro vehicles - acorn boats ladybug wagons?
Worker bugs - Resource transport, night light fireflies and auto repair bugs?
Smart building system - Blueprint memory for builds, Customisable items (flags, signs, trap doors)
Tiny tech -Walkie talkies for long range comms, Bug sonar radar, motion sensing alarms?
Mini chemistry set?
Mini quests/bug diplomacy, Bug reputation unlocks secret items?
Base seige events with different bugs and opportunities to recruit a bug army for defence?
Kid invasion events? Full size kids sneaking into park who think its funny to stomp bugs squish ands and burn with magnifying glass - ominous thuds and shaking grass - have to hide, evade or set traps? (Fake dog barking traps to scare mud bombs to cause slips, slingshots to blind and decoy insect army made with items found in park?)
Seasons?
Spring - baby bugs and pollen storms?
Summer - high bug activity, heat exaustion risk?
Autumn - decaying leaves, fog, increased worm activity
Winter - survival mode, bugs hibernate, food vanishes, water freezes, winter craftables (sleds / snowball launchers)
Plenty of easter eggs to find
Dog zone? Stray dog wanders into park to avoid, potential to befriend it to have it bring gifts?