Sure! The 'minimum requirements' on the Steam store page is basically my Windows computer, and the Macbook I have ;) For previous games I used to support Ubuntu Linux too, but the cost of supporting such a limited player base didn't work out for me, sorry Linux people, maybe again one day!

I use Unity (currently 2019.3, probably moving to 2020 soon, for the new v2 of the Hybrid Renderer package) and C#. Photoshop for painting with an Wacom Intuos 5 tablet (Adobe Script for slicing and exporting), Spine for animating (highly recommended! Check out esotericsoftware.com), Modo for all my 3D needs. Git for version control, Gitlab for hosting, and lots of Python and Django for the web service parts of my current game, as well as my website. Lots of Google Sheets for marketing and accounting.

And, of course, paper and pens to doodle and make notes and keep track of where everything is at and what I'm working on next.