THE BAD:
graphics could be better... it's basically impossible to beat this unless you unlock everything. The store unlock system is very flawed.
SUMMARY:
As you play, you gather points. Sure a billion points seems like a lot, and you think you can buy some extra lives or continues so you can go further but boy are you wrong.
You need about 1.2 sextillion points to buy 7 continues. I've already unlocked 5 and it's nowhere near enough to allow me to get even near the end of the game.
All these cool features are unlockable by gaining points... the hard part is getting them.
To get massive points you need to stay alive, which starting with the second stage on...seems like a real challenge if you're playing alone. Even with two players it's incredibly hard.
This bring the frustration levels to monstrous...