After Tower Unite has released 1.0 there are a few cool things I would add to attract players for future updates.
Kind of like Fortnite how they had the meteor before season 4 there would be weird catsacks appearing across the map, or new characters are selling items that relate to the new update.
Then when the update is officially announced an event is made for the release of that update! (if its not just bug fixes or whatever. For example a new gamemode, map, etc.)
EX: Panic at Horror Hill Update.
-New npc appears at night and talks about being hunted by ghosts and sells an accessory of some sort.
-Strange music playing in certain areas
-Update is officially announced and launch part will happen at 6:00 PM. Earn extra currency/Exclusive first 24 hour release items.
Exciting, and fun!