It is a pretty solid game! The graphics and audio are really cool, except for the "fox voice" which was really loud, sharp and saturated during my playthrough (maybe it is because of the browser version? Idk).
The idea/concept is very cool, I really like it. However, it is really difficult, mainly because of the time gap between the two foxes and because obstacles are very demanding (you have a very little margin for the baby fox, which is more difficult to see because oriented upside down).
Overall : very cool and enjoyable game!