Average
Gameplay is bad - I've fd up with the prelast level, killed 15-20 of my lifetime and don't want to play anymore. I think it's excellent when a player wants to play the game more amd more. But it's not about this.
Maybe you should make more lifes for a player by default? Or remove life limit at all? The gamer should receive pleasure I think, the game shouldn't annoy the more such a game. And the game itself is quite monotonous...