I've compiled the phenomenal game briquolo for the N900.

However it's unplayable, as at the 800x480 resolution the pfs are around 1.

When the game starts it reports:

SDL tells that the following fullscreen resolutions are available:
800x480

Now, even when not running fullscreen only this resolution is available.

Can any lower resolution be enabled so that it's playable? Why even non-fullscreen doesn't work, as it does nicely on a PC?