TD

Features:
*The player "mines" blocks to create a maze.
*Every minute a new wave of minions spawns.
*The minions will try to attack the player, however it can only walk through the player created maze.
*To defend the player has to create a wall to block the minions getting through.
*The player can create attack towers to furthermore defend against the waves.
*Everywave has either a boss or a unique type of minion.
*The map is filled with treasure for the player to find.
*Every minion has a chance to drop either resources or a recipe for the player to collect and build new towers etc.

Roughly made image: https://gyazo.com/cf3cc02b40e2149fffb2db773c5de3e7