Just came across this.
Cheapest this has been in the Australian eShop is $1.44.
For what it's worth, I very much enjoy this game and so have a few media outlets that gave it very high review scores.
It's an open-ended puzzle platformer where you build your own solutions.
I'd say the reason for the heavy and frequent discounts is the art style which, despite not having an issue with it personally, I can see would put others off.
Also I'm not sure how to find an actual purchase link for the US eshop via a browser, but it should be accessible via a switch console and an account that is attached to the North American region.
Asking for a friend; can you buy games from the US shop on your Australian account and play them without switching profiles?