Played the whole game with just the keyboard. It is perfectly doable - just requires a little bit of time to get used to. Since then it's my favourite game of the last 5 years, a real gem... what I didn't like was the lack of proper information on the screen what buttons do what ( in the inventory and so on ).
I think the author of this site is a tad bit too optimistic regarding the advancements in code development, that are waiting for us in the future. Code writing tools or new input devices, maybe some other paradigm shift.