ok, thank you, this installs fine.

now I have:

/home/user # apt-get clean
/home/user # apt-get install brainparty
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages were automatically installed and are no longer required:
python-runtime libart-2.0-2 gnome-python python-all libqt4-maemo5-svg python-gtkhtml2 python-bluez libgnomeprint2.2-data libgtkhtml2-0
maemo-geolocation python-conic libgnomeprint2.2-0 librsync1
Use 'apt-get autoremove' to remove them.
The following extra packages will be installed:
brainparty-data libsdl-gfx1.2-4 libsdl-gles1.2-1 libvorbisidec1
The following NEW packages will be installed:
brainparty brainparty-data libsdl-gfx1.2-4 libsdl-gles1.2-1 libvorbisidec1
0 upgraded, 5 newly installed, 0 to remove and 24 not upgraded.
Need to get 41.0MB of archives.
After this operation, 44.0MB of additional disk space will be used.
E: You don't have enough free space in /var/cache/apt/archives/.

how much root space it needs? this is what I have:

/home/user # df -h
Filesystem Size Used Available Use% Mounted on
rootfs 227.8M 194.7M 28.9M 87% /
ubi0:rootfs 227.8M 194.7M 28.9M 87% /
tmpfs 1.0M 68.0k 956.0k 7% /tmp
tmpfs 256.0k 84.0k 172.0k 33% /var/run
none 10.0M 72.0k 9.9M 1% /dev
tmpfs 64.0M 4.0k 64.0M 0% /dev/shm
/dev/mmcblk0p2 2.0G 559.1M 1.3G 29% /home
/opt/pymaemo/usr/lib/python2.5
2.0G 559.1M 1.3G 29% /usr/lib/python2.5
/opt/pymaemo/usr/share/pyshared
2.0G 559.1M 1.3G 29% /usr/share/pyshared
/opt/pymaemo/usr/lib/pyshared
2.0G 559.1M 1.3G 29% /usr/lib/pyshared
/opt/pymaemo/usr/share/python-support
2.0G 559.1M 1.3G 29% /usr/share/python-support
/opt/pymaemo/usr/lib/python-support
2.0G 559.1M 1.3G 29% /usr/lib/python-support
/dev/mmcblk0p1 27.0G 9.5G 17.5G 35% /home/user/MyDocs