Great prices for these games - Undertale is especially recommended and more than worth this price.
Note that the sale for Undertale ends on 22 September so get it soon if you want it.
Draw a Stickman: Epic 2: https://ec.nintendo.com/AU/en/titles/70010000006941
Think of the Children: https://ec.nintendo.com/AU/en/titles/70010000010064
Space Pioneer: https://ec.nintendo.com/AU/en/titles/70010000026274