Openlierox_0.57-beta3 is available from diablo extras-devel for testing. Tarball in the first post probably has the same version. Minimum installation is around 7MB and you can install extra level and mod packs.

Newest version of openlierox is beta5, but I haven't managed to get that working. It's segfaulting somewhere in libstdc++ which is not good at all.

Tell here if is this version is working good enough and I'll promote it to maemo extras

Here's link to home page: http://openlierox.sourceforge.net/