Just finished NaissanceE in Proton. What an epic game! It starts out humbly with some small light/dark jump puzzles... but stick with it and you will traverse through massive surreal areas.
There were several areas that I almost gave up. Very difficult jumps, puzzles and repetition. On occasion I had to look up the solution online, but I would try to solve it myself several times before giving up.
This game has a real geometric Tron-ish graphical style. Even the music has the synthetic digital sounds like in Tron.
I was able to play with all the settings on high. VSync enabled prevented screen tearing.