Slow, dull and short
Mmmm, the sequel to a decent metroidvania is short, linear and has few and upgrades are nothing but GO HERE NOW signs. Not feelin it. Music was good, visuals were ok but nothing else really worked.
The level design was pretty dull, especially the enemy placement in Mom's area. Complete non-threats that serve no purpose but to waste the player's time. The addition of the sister didn't really add much, since by the time you have her you hit but a single puzzle requiring her existence, which is blindingly obvious how to solve.
Overall this felt like it could easily have just been the intro cutscene to a real sequel without losing anything.