haha, thank you ! at the beginning, I aspired to offer a choice between 3 avatars (their sprite are in the game files xD) but... spent way too much time in the colliding system (which is stil buggy indeed.... é_è).
For the left move it may be a problem of QWERTY/AZERTY keyboard maybe (since I'm from an AZERTY country).
Anyawya, thanks again ! :)