Absolutely one of the best free Steam games I have ever played. There are no graphic options and you cannot remap the controls, but everything just works. I am playing in 4k resolution at a solid 60fps and never dropping a frame. The graphics are nice too. The missions are small, so I guess I can deal without a quick save. Gameplay is fantastic and very rewarding once you make it to the end of each level. This game is highly enjoyable and I can most definitely recommend it.