I'll take the good with the bad
Good:
*Enemy Designs and unique deaths for each
*Fast paced action
*Upgrades really show
*Cool intro (although it goes with all your games...)
Bad:
*The screen gets so cluttered you can't see the deadly shit that's flying at you
*The lag in the controls after you respawn accounts for a quarter of my health bar lost each time
*No need to limit ninja stars as they end up in infinite supply
*Too Short
*Needs a boss fight
*Maybe needs to start slow then get frantically fast
*If longer, needs extra lives scattered in with the carnage
Overall, I enjoyed it and was disappointed when it came to an abrupt and unceremonious end