Nothing really special.
The weapons and the clone zombies are all the same with different health and effects.
The part of adding new types weren't good enough to make the game better.
Plus you added a dumb ending.
At the end it says like this
You still survive!! but the zombies have not run out. Your telekinethic power is very low, and they are getting close.
Is this a bad ending of the several endings or is this the only ending?