Finally got out of my Drag&Drop + Collisions usual problems
its now possible to play a whole loop and have a game over if
you touch a falling spiky-block or if you collide your 2 buttons

remaining things :
– manage a score counting logic
– change ennemy spawn and speed overtime
– putting a button off-screen will lead to gameOver too
+ Sounds / VisualCoolEffects
(Maybe a button to restart but dont want to spend time on this)