fullscreen doesn't work in the game xwelltris

Binary package hint: xwelltris

Running xwelltris in fullscreen, as one normally do with games, does not work.
On the games current webpage http://xnc.jinr.ru/xwelltris/installation.html it says that one can run
xwelltris -full
from command line to start it in fullscreen, but that doesn't work
(and there seems to be no setting or key to switch to fullscreen either)

btw, in the games graphics it is still saying VERSION 1.0.0 instead of 1.0.1
and its old .su website that doesn't work.

1) Description: Ubuntu 10.04.1 LTS
Release: 10.04

2) 1.0.1-14

3) to run in fullscreen

4) is still running a small 800x600 window