As per Vooks:
https://www.vooks.net/twenty-australian-new-zealand-switch-e…
(Link directs to Assault Android Cactus as I know one of the Devs uses this site :) )
The games and prices are as such:
First Time on Sale
✚ Assault Android Cactus (Witch Beam) – $21.00 was $30.00 (30% off)
✚ City of Brass (Uppercut Games) – $13.99 was $19.99 (30% off)
✚ Feather (Samurai Punk) – $11.47 was $13.50 (15% off)
✚ GoatPunks (Studio Canvas) – $10.68 was $13.35 (20% off)
✚ OTTTD (SMG Studio) – $7.49 was $9.99 (25% off)
Highest Discount
✚ Crawl (Powerhoof) – $11.99 was $19.99 (40% off)
✚ Death Squared (SMG Studio) – $5.81 was $14.99 (61% off)
✚ Framed Collection (Loveshack/Fellow Traveller) – $7.50 was $15.00 (50% off)
✚ Hand of Fate 2 (Defiant) – $20.99 was $29.99 (30% off)
✚ Mini Metro (Dinosaur Polo Club/Radial Games) – $10.39 was $12.99 (20% off)
✚ Poly Bridge (Dry Cactus) – $11.25 was $22.50 (50% off)
✚ Putty Pals (Harmonious Games) – $6.37 was $12.75 (50% off)
✚ Screencheet: Unplugged (Samurai Punk) – $12.59 was $17.99 (30% off)
✚ Siegecraft Commander (Blowfish Studios) – $7.48 was $24.99 (70% off)
✚ Storm Boy (Blowfish Studios) – $3.49 was $6.99 (50% off)
✚ Super One More Jump (Premo Games/SMG Studio) – $1.59 was $7.99 (80% off)
✚ The Adventure Pals (Massive Monster/Armor Games) – $10.80 was $18.00 (40% off)
✚ The Gardens Between (The Voxel Agents) – $14.99 was $29.99 (50% off)
✚ The Warlock of Firetop Mountain: Goblin Scourge Edition (Tin Man Games) – $24.49 was $34.99 (30% off)
✚ Think of the Children (Jammed Up Studio/Fellow Traveller) – $7.80 was $19.50 (60% off)
Some metacritic scores to help some decision making:
Assault Android Cactus - 86
Mini Metro - 86
Death Squared - 78
Adventure Pals - 77
Super One More Jump - 81
Screencheat - 75
Gardens Between - 79 (8.1 user score)
Framed Collection - 79
City of Brass - 75
Haven't looked up all the games, but this is a good start