No Gravity 2.00, a fantastic and futuristic universe made of five intergalactic 
worlds.An arcade type game with great playability, where it is easy to plunge 
into space battles against spacefighters, space stations and more! 
The source code of the classic No Gravity was released by RealTech VR, Ltd. 
on February 16, 2005. Release 2.00 for OS/2.

You should install some dll (and related dependencies), this is the complete 
list of all packages containing all main dynamic libs (dll) you should 
have to play No Gravity release 2.00 on OS/2:

ftp://ftp.netlabs.org/pub/gcc/gcc4core-1_3_1.wpi (*.dll)
ftp://ftp.netlabs.org/pub/gcc/libc-0.6.6-csd6.zip (*.dll)
http://hobbes.nmsu.edu/download/pub/os2/dev/SDL-1.2.15-20160303.zip (*.dll)
http://hobbes.nmsu.edu/download/pub/os2/dev/mm/libvorbis-1.3.5.zip
http://hobbes.nmsu.edu/download/pub/os2/dev/mm/libogg-1.3.2.zip

To install as user, usually executables and libs should be respectively somewhere 
in path and in libpath statements, unzip and enjoy!

For netlabs.org's yum/rpm users: 

yum install libc libgcc1 libgcc-fwd libstdc++6 libsupc++6

Will install all main necessary packages 

See also the README file included.

I played No Gravity game using only mouse and keyboard, no Joystik to test,
window and full screen.

More info and sources are available at:
http://www.nogravitythegame.com/classic/
Gianfilippo Cimmino (gianfi dot cim @ gmail dot com).