The game is fun.
The enemies are boring and almost everyone is the same thing but with more/less HP: Zombie going after you, big zombie going after you, orange zombie going after you, sword guy going after you. (The giant robot is fun)
Its hard to understand the upgrades, why not Swat is inside the shop? Why there's a giant lase robot inside the shop (I got killed by the boss due the surprise, i was expecting some overpowered upgrade)? This "danger" sign is another boss?
And the machine gun/red upgrade are making the enemies faster, this is a bug?