You buy it from Nintendo switch, steam, xbox, or PlayStation.
Undertale was created by Toby Fox, a game developer for the Mother series. You can actually find him in Earthbound as a dog in the shop in Onett. After Undertale, he later went on to create Deltarune Chapter One. Toby Fox's true identity is yet to be fully revealed.
A lot
Yes, you can play Undertale on a Chromebook by using a few different methods. One option is to use a platform like Steam through a Linux installation, as Undertale is available on Steam. Alternatively, you can use an online emulator or cloud gaming service that supports Undertale. However, performance may vary depending on the method you choose and your Chromebook's specifications.
yes
Yes but no at the same time
Sans
yes yes he did
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Sun Flower
Undertale
Toby Fox. He also I believe he "developed" Pokemon sun and moon, or sword and shield.
2 years "old" it was made in 2015