I haven't played it yet - I generally keep to one "console", one "handheld" and a couple bite sized games at a time. VIII is a title I'd play handheld, but I'm focused on Fire Emblem right now. But, it's not going to go on sale for a while and I'm a sucker for Final Fantasy, so I caved. FWIW, the "console" game I am working on is the final missions in Starlink, before moving onto Astral Chain this weekend. The bite sized games are Donkey Kong (1994; GB) and Mario vs. Donkey Kong (GBA), that I seriously can't believe I missed when I was younger, as well as Theatrhythm Final Fantasy (again, FF sucker) that is definitely inferior to the later Curtain Call updated release.
March of the mini's is indeed an awesome game, love the lil movies in it as well about the fun new mario toy recall being really impressed with those when I got it on the GBA, reminded me of Warioware Inc. As for playing the first release of Theatrhythm if you have Curtain call... there's no real point I think, I beat everything 100% in The original release of that and looked over what curtain call offered was pretty much everything in the game I played and a tiny bit more so I didn't get the 2nd version of it, but if you started with curtain call, think you can just say you've also played what's good in theatrhythm.
Fancy hearing me on an amateur podcast with friends gushing over one of my favourite games? https://youtu.be/1I7JfMMxhf8