awesome!
I think its very good yet you seemed to have regressed from "Toss the turtle".
The shop and the upgrades is what made TTT so good, how your control over the course of fire is evolving and your canon looks awesomer and so on.
Here nothing realy changes you only buy more randomalty to play on the field (that and more life). the wall jumpig dosnt matter since the walls dissapear.
So I belive; more "control" to purchase at the store like skills and such, and the char' evolution is certinly awesome.