Shift has the problem of bringing up windows sticky keys dialog box if you tap it too fast. Spacebar was my instinct for fire key as well. For map it would be 'M'.
Whichever you choose, please consider displaying the controls inside the game, at least during the setup screen, don't make the user search for controls in the wiki. :)
Also the hp bar below the minimap is a bit weird, would expect it the same as enemy ships above my ship, so i can see if i'm winning or losing a cannon exchange like in a rts game. Or at least someplace more convenient to quickly glance at nearer the center of the screen.
Very fun game by the way, well done! Scratches the nostalgia itch of 'Corsairs Gold' for me.
> Shift has the problem of bringing up windows sticky keys dialog box if you tap it too fast.
An operator fixes this forever by turning off that "enable Sticky Keys" keyboard shortcut. I've not used Windows 11 or Windows 8, but in every other version that had the Sticky Keys feature, I remember there being a prominent "Don't enable Sticky Keys when you press <whatever> X times in quick succession" checkbox in the dialog that let you configure Sticky Keys and related accessibility things.
Over the years, I've seen so many videogame streamers get screwed over by the "Activate Sticky Keys??" dialog pop up that it became pretty clear that they were all keeping it in reserve for the entertainment value. Maybe regular folks get so flustered by it that they don't bother to read the system dialog that pops up.