Golden Week held up the confirmation. (UPDATED)
UPDATE MAY 7: Nintendo has confirmed the games below will come to the lineup on May 15. Original story follows.
It looks as though May's NES lineup for the Switch Online app will feature plenty of climbing and riding.
- Donkey Kong Jr
- Clu Clu Land
- Vs Excitebike
Donkey Kong Jr and Clu Clu Land are both early/black box titles of the NES, while Vs Excitebike is a version of the bike racer originally released for the Famicom Disk System before releasing on the Wii U's Virtual Console in 2015.