Cool game! (same game name x)
It is REALLY not french keyboard frendly though T-T, you should addd the possibility to move and change gravity with arrows. Other than that the concept is cool, the music works fine, but I think one min is a bitmuch for the easier lv so I think you should change the duration depending on the lv.
And the fact that we can just do left right in the middle and not change gravity is really sad (you should do a thing that for like 5s kill the player if he is on one of the two floors
good luck for the rest of your gamedev experience!