I could not get anything to work with M+K, none of the RTS controls I am used to worked. Left-click select, right-click move did not work. Left-click select, left-click move did not work. Select with control (no click+drag?) selected stuff but I could not get the units to do anything.
I gave up.
Would strongly advise the author not to break from convention here.
To shed some light on the somewhat unusual controls – there are some additional considerations I had to make that don't necessarily exist in other similar RTS.
1. The fact that it's all in the browser doesn't allow for panning the map with mouse-over-edge.
2. People often play the game with mouse and keyboard AND typing code at the same time, so the controls had to be tailored to minimize conflicts
3. The whole idea behind the current manual controls UI is to highlight what is possible to program for the players themselves. It's not 'technically' part of the game, it's just an injected html/css/js so the players can edit the controls to whatever would feel more natural (and add new buttons or completely change the mechanics).
But you are not the only one highlighting these issues, so I'll think about how to make it more intuitive and abide to conventions as much as I can.
I gave up.
Would strongly advise the author not to break from convention here.