Option 1: 5 New small maps
Option 2: 1 New game mode, protect the castle and wave system.
Option 3: Improve the merchant, add more items in merchant room. Such like options and etc.
Option 4: New skills unlock

• Summoner: Unlocked at level 100;
  • Summons a unit based on upgrade level and mana

• Berserker: Unlocked at level 50;
  • Summon powerful lightning’s that deals massive damage to the nearest monsters

• witch: Unlocked at level 250;
  • Summons bats that steals the health of monsters and increases players health

• Freezer: Unlocked at level 200;
  • Freezes all monsters in in it’s radius from the player

• Invisible: Unlocked at level 10;
  • Become invisible and undetectable from enemies for the duration of the ability

• Enhancer: Unlocked at level 20;
  • Increases the players speed, damage and critical damage for a set duration

• Healer: Unlocked at level 150
  • Create a spell zone where the player can massively regenerate health

• Ninjutsu: Unlocked at level 300
  • Teleport the player to mouse coordinate and create allusions of the player

Disclaimer: these details are not final and unlocking each ability has more requirement such like achievements and events.

Please vote in the comment section, 1 vote only per person