Once your mouse has control of the ship, click to give the window focus.
T = show/hide controls
space : fire
D : open/close wings
F : boost (with wings open)
S : cycle to next weapon
1 : select weapon 1
2 : select weapon 2
3 : select weapon 3
4 : select weapon 4
5 : select weapon 5
6 : select weapon 6
7 : select weapon 7
8 : select weapon 8
9 : select weapon 9