About the keyboard, because I use an AZERTY keyboard and I did not realize the configuration not working easily for the QWERTY configuration. I will update this feature in a future release of my game with an option menu to configuration your command.
For the bounce modifier, I already thought about it, but I wanted to release a first version of the game and will update it with potential player feedback ;)
So, thank for your comment, and I will update the game during my free time.