For your first game it’s a nice little platformer.
As someone who uses an AZERTY keyboard myself but you should probably prioritize QWERTY next time or use something that maps to the location of the keys on the keyboard rather than to the keys itself (idk how that works in Godot)
Also as other people have already said, between movement, scaling and potions you need 3 hands to play this, you should probably put the potions on left/right arrows or A (Q on QWERTY) and E. (Also space to jump is probably better)
Other than that changing the size of objects in the level is an interesting concept, good job!