It's a nice concept. More upgrades like the double firerate zone would be nice. And also different enemy types? Like, forcing the player from one zone to another, depending on the enemy type.
Still quite impressed! Hope to see more of this :D
Thanks for your feedback! I was looking for good challange and your idea to force them go to a zone is really nice! Maybe something like cats and creepers? I'll surely find a way to add that. Thanks again! I'll improve it and I hope you like it even more that time!