There is no manual fire....

There is no manual firing mechanism, it is evident that this game was lazily ported over from iOS.

Developers need to realize that when porting a game from iOS to the Mac better control schemes are possible, expected and desired.

When porting things over, developers need to re-evaluate design decisions that were made for the sake of a buttonless touch screen interface and throw those away.

I.E. LET THE USER CONTROL THE GAME.

Venom32 about Radiant