If you want to see the low barrier of entry for the Wii U, just check Cube Life.
Nintendo eShop Sales: Aug 03 - Aug 09
Nintendo Switch
(N) 01. STRIKERS1945 for Nintendo Switch (Zerodiv) [03.8.2017]
(-1) 02. Splatoon 2 (Nintendo) [21.7.2017]
(-1) 03. Minecraft: Nintendo Switch Edition (Mojang) [12.5.2017]
(N) 04. GUNBARICH for Nintendo Switch (Zerodiv) [03.8.2017]
(-1) 05. Snipperclips: Cut it out, together! (Nintendo) [03.3.2017]
(-1) 06. Mario Kart 8 Deluxe (Nintendo) [28.4.2017]
(N) 07. ACA NeoGeo Aero Fighters 2 (Hamster) [03.8.2017]
(-5) 08. Namco Museum (Bandai-Namco) [28.7.2017]
(-3) 09. The Legend of Zelda: Breath of the Wild (Nintendo) [03.3.2017]
(N) 10. Rei-Jin-G-Lu-P (Kemco) [03.8.2017]
Nintendo 3DS
(=) 01. Dragon Quest XI: Echoes of an Elusive Age (Square-Enix) [29.7.2017]
(=) 02. Kirby's Blowout Blast (Nintendo) [04.7.2017]
(+3) 03. Dai Gyakuten Saiban 2: Naruhodou Ryuunosuke no Kakugo (Capcom) [03.8.2017]
(-1) 04. The Battle Cats POP (Ponos) [31.5.2015]
(B) 05. Brave Dungeon (INSIDE SYSTEM) [30.11.2016]
(-2) 06. Ice Station Z (Wobbly Tooth) [06.4.2017]
(-2) 07. Maido Hebo Shougi (Arc System Works) [03.4.2013] (was on sale)
(-1) 08. ByeBye! BoxBoy! (Nintendo) [02.2.2017] (was on sale)
(+1) 09. Bike Rider DX (Spicysoft) (was on sale)
(-2) 10. Frontier Days: Founding Pioneers (Arc System Works) [16.12.2015] (was on sale)
Wii U
(=) 01. Splatoon (Nintendo) [28.5.2015]
(=) 02. Minecraft: Wii U Edition (Microsoft) [17.12.2015]
(N) 03. Cube Life: Pixel Action Heroes (Teyon Japan) [09.8.2017]
(N) 04. Tallowmere (Teyon Japan) [02.8.2017]
(+5) 05. Super Mario World (Nintendo, Virtual Console) [27.4.2013]
(-2) 06. Mario Kart 8 (Nintendo) [29.5.2014]
(+2) 07. Super Smash Bros. for Wii U (Nintendo) [06.12.2014]
(-1) 08. Discovery (Rainy Frog) [31.8.2016]
(-6) 09. The Legend of Zelda: Breath of the Wild (Nintendo) [03.3.2017]
(-5) 10. Art Academy: Sketchpad (Nintendo) [08.8.2013]
https://topics.nintendo.co.jp/c/article/9a242916-7b15-11e7-8cda-063b7ac45a6d.html