For Switch demos, just search "demo" in the eShop

[VGPolyglot]

KLAMarine said:

Blaster Master Zero's great btw. It's like Megaman with a Batmobile.

I have Blaster Master: Blasting Again for the PS1, I enjoyed playing it as a kid. However, I never played the NES game, and Zero looks to not have a physical release unfortunately.