Anyone who has played strategy games will know what to do. Considering its an educational game, its pretty well made. Flanking etc is pretty realistic.
There is a pause key, its at the top of the screen.
That button is so useful....
Strategy-wise fairly straightforward. Get the best energy station first, a few defences, then spam small ships.
Didn't see this mentioned, but has been very useful for me... Should think about switching low-hp characters to backup during battle.... They get healed both HP and MP per turn, so it represents an MP/Item-free way of healing characters.