Well my struggles were largely with shift/control to melee/shoot. I'm not sure exactly where I think they would be better, maybe on Q or E? Or maybe just moving one button to Q or E or something so they weren't both controlled by my pinkey.
Alternately if there were a way to use both hands on my keyboard it might feel more like an actual arcade machine, like using J K L for the three buttons. If you were to do that though you might have to change how you actually repair the buttons, but it would free up the spacebar, so maybe you could use that? Or maybe you just have to switch back to the mouse, although that could be tough. Might be worth a try if it's easy to swap the controls around.
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That's actually a very valid argument on using two hands on the keyboard would make it feel more like an arcade machine. Thanks for the suggestion, perhaps changing context and making the player switch from keyboard to mouse would indeed make it feel more like the real experience of fixing a machine in order to keep playing, perhaps we could add a slow time effect in order to make it less hardcore.
Again, thanks for the valuable feedback