Thank you so much! It is great to see you enjoying our game :-) Spread the word about it!
We are looking into the issue with the alt-tab. Not sure though, if we can fix it because a lot of Unity2017-based games seem to have this (e.g. Ghost of a Tale).
@Jammet you are right concerning the lower resolutions, especially sub-640x480. The game is barely playable at those resolutions and it is not meant to be used as pixel-mode. But be sure to check the options menu after you finished the game ;-)