>Supple amount of continues, almost to a point where you don't need them
>Farming lives just by being thorough can usually grant you 5 lives before you hit anything major
>Fire and Laser, while are not Spread, can fuck up specific enemies and setups. Like how Laser in 3rd person stages basically one-shot turrets (Fire is useless here), but Fire is great for the over-head bosses, and can be okay for Waterfall (is shit for the tank sub-bosses and level 7's boss where's stray shots from the regular Machine Gun or Pellet shooter is more reliable).

I guess the biggest flaw is the final level is a bit easy, but it's almost a victory lap.