I played a while back the demo of Daisenryaku SSB on Switch because I craved a bit for some Advance Wars-like gameplay, and it felt like coming back from the early 00's of shovelware.
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Nippon Ichi Software is the first publisher that comes to mind in terms of experimental stuff, and I would easily recommend Yomawari 3 (horror game, doesn't need to play the previous games beforehand) and MAD RAT DEAD (rhythm platformer). I recall Grimgrimoire Oncemore (fantasy 2D RTS) has a planned western release, and it is also published by NIS even if developed by Vanillaware. Pretty sure there is a ongoing big sale of those NIS games on Switch due of the current Golden Week.
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among other unusual games on the system, there are Black Bird (shoot em up) and Elechead (puzzle/platform - recorded vid below) which I appreciated as well
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The Earth Defense Force franchise fall into that category as well, although with the exception of World Brothers, all the titles on Switch are sadly exclusive to Japan. Which is too bad because the Switch versions of the older entries are the definitive editions, and the online (for 2 & 3) was a lot more populated compared on the Playstation Vita.