It's not implemented so far, but there are already some alternatives.

For example for movement you can use both the arrows and WASD, to swich you can use Z and Shift and to grab objects with Ophelia you can use X and Ctrl.

ah, that config works well... but I wish c could be used to jump... would it be too much to ask you add that in to your "z for switch and x for grab" configuration?

For that matter, does the game use the mouse? big difference between mouseless and mouse platformers in terms of keyboard config.

Sure, we'll add C as an alternative jump button in the next update.
Also yes, you use the mouse in the game as well.

oh, lol, then I will stick with WASD for movement and space/w for jump. mouse oriented platformers always work better that way. Right, I will buy the game soon.

That's what we thought as well because the game uses the mouse.
Anyway, I hope you enjoy the game, ask here for anything you need and we'll work it out!