That's good to hear! The tower defense part will not involve "towers." Instead, it will take the form of upgrades for the Orb and drones that you can materialize as long as you have enough "matter," a key resource in the game that was cut too. The only way to acquire matter is by destroying asteroids or rogues. The Orb you're defending is a massive "Dyson Sphere" built around the last supermassive blackhole by all the remaining intelligent beings. The Rogues, also intelligent beings, have the opposite goal: to let oblivion happen. That is why they want to stop you. The lore sounds interesting right?