I'm a couple hours into Samus Returns, here's my thoughts so far:
The 3D effect is pretty good, but REALLY shines on still screens of artwork (Like the opening screens and the Chozo Memories Gallery).
So far I've seen, like, 6 enemy types in the 2-3 areas I've gone through.
The melee counter's kind of neat, though I'd rather the cannon be a slight bit more powerful instead.
Metroids seem a good deal harder to kill than in the original. Granted, I haven't played the original in so long that I barely remember said difficulty in it.
Free-aiming with the circle pad is nice.
Fusion Suit mode makes the game Demon Souls feel like a Spyro the Dragon game in comparison to difficulty. You get to run around in the Fusion Suit, which IS pretty sweet, BUT the first enemies you see in the game can stomp you completely into the ground in 2 or so hits if you aren't careful.
With all that said - still a pretty fun game. Definitely worth a go.
Oh, in case anyone bought the game off the E-Shop, is playing on a 3DS that can run homebrew, and don't feel like dishing out the extra cash for Amiibos for content already built into the game (yes, that's ALL they do - unlock stuff that is blocked off for no real reason other than an extra cash grab), then you'll dig this save file someone posted on GameFaqs:https://www.dropbox.com/s/dq3y6dkv4ejh2so/fusion-3%20amiibos%20zero%20percent%20%28thanks%20to%20flash-sama%20and%20wiifan420%29.rar?dl=0
There's 3 different exported saves to pick from. I used Profile 1 since it has all the amiibos scanned, is in Fusion Mode, AND is at the very start of the game. Also has all the galleries unlocked, to boot!
Easiest way of importing a save -
>Download JKSM (save manager)
>Start JKSM, export your current save file
>Replace the files in your exported save with ones from one of the three included in the rar
>Start JKSM, import your save file, and you're done.