I didn't play much yet, but here are my very first impressions. I will give more after more play time.
a/ The game runs good on Linux, no related issue so far, thanks for the support.
b/ Without any guidance, i immediately felt very attracted by the first level. What is it, what to do, how does it work ? And it was very easy to get the main point, just clicking and moving around. I guess many people will ask for a tutorial, but i think it fit the game NOT to have one.
c/ I think the game should/could be fully playable with mouse. Now i have to use too many keys for not many use, all could be fused together into just arrows and clicks, or just click.
d/ i don't have a qwerty keyboard, glad i could rebind all the keys or it would have been unplayable. I didn't try the pad yet, i have a XboxOne under some dust.
e/ i like the settings, it's kind of mysterious and techy...