Gravity Circuit is free on Steam right now:
https://store.steampowered.com/app/858710/Gravity_Circuit/
"Gravity Circuit is a flashy action packed 2D platformer in the spirit of console classics. Follow Kai, a lone operative war hero who harnesses the mysterious powers of the Gravity Circuit, on an adventure in a futuristic world inhabited by sentient robots."
https://store.steampowered.com/app/858710/Gravity_Circuit/
"Gravity Circuit is a flashy action packed 2D platformer in the spirit of console classics. Follow Kai, a lone operative war hero who harnesses the mysterious powers of the Gravity Circuit, on an adventure in a futuristic world inhabited by sentient robots."