My gosu entry for Ludum Dare #16, spent tops 5 hours on this but it turned out pretty decent.
I think ppl will find it was worth 5 minutes of their lives once they played it through.

~~~ the light at the end of the tunnel
A Ludum Dare #16 entry by ippa

~~~ download
Source: http://github.com/ippa/the_light_at_the_end_of_the_tunnel
Win32: http://ippa.se/games/the_light.exe
Mac: comming soon, right jlnr? :)
Homepage: http://ippa.se/gaming

~~~ play from source
Ruby 1.9.1 - download from http://ruby-lang.org/
Rubygems "opengl", "gosu", "texplay" and "chingu"  - gem install <gemname>

... Oh, also tried to push our Ruby, Gosu etc in my post mortem: http://www.ludumdare.com/compo/2009/12/14/ruby-opengl-and-pixels/

Looking @ http://www.ludumdare.com/compo/ludum-dare-16/?action=preview .. I got some ideas. First off, you might wanna submit a square image as primary thumbnail + zoom it in.

I turned http://www.ludumdare.com/compo/wp-content/compo2/thumb/ec085bf11ac961960188bfee9d1153b8.jpg into http://www.ludumdare.com/compo/wp-content/compo2/thumb/a4ce7ea80397d73b887829a0c16380b0.jpg .. in the first you just see some blurry red, in the second you get a sense of the player etc. And the second takes up more real estate in the list :p.

Another thing... if you name your game a bit smart, starting with "." or numbers,  you'll get highest up, maybe not the most honest thing to do oh well. Just noticing that's how they sort.

It appears that no such gem "opengl" exists.

I tried to gem install ruby-opengl to see if that was the same thing, but to no avail, for it tells me that it fails to build the native gem extensions and then proceeds to spit out a lecture-length error. I'm on Ubuntu 9.10 with ruby 1.9.1, if that says anything to help the problem, although it did not work with ruby 1.8.7 either.

Yeah, for some reason the gem is called "ruby-opengl" :)

I guess your rubygems version is recent? This gem has a tendency to always require the latest version.

@phelps, im on ubuntu and i do not get that error, can you pastie the error msg? my immediate guess is you do not have the opengl headers installed.

damn, didn't know the open gl gem would cause so much trouble ..

jlrn: retrofy in next release? *puppyeyes*

The details of the error can be found here.

When I used "gem -v" it returned 1.3.1

As an aside, when I tried to play selene, banister, it spat out a segmentation fault in texplay of some sort.

Geez. None of the games seem to be working for me.

yeah, the segfault in texplay only happens on some versions of linux and should be fixed when 0.7.16 gosu is released.

the error in ruby-opengl is due to this: "/usr/bin/ld: cannot find -lruby". On my system the library is called -lruby1.8 and -lruby1.9. I got the same error when installing the ruby-opengl gem and i fixed it by creating a symlink from ruby1.8.so to ruby.so and reinstalling the gem, a similar
thing can be done for ruby 1.9

IMO if you want to play ippa's game it's best to dl the windows version and run it in WINE (since tp will still segfault on your system so you wont be able to play it from source)

A Ludum Dare dude (sfernald) hacked up some new levels to my game .. I just played through it, hard but fun =). He actually used the game engine better then I did.

Blogged about it @ http://www.ludumdare.com/compo/2009/12/18/new-levels-to-my-pixely-ruby-entry/  .. also includes some ideas for a sequel.

Or just DL it:
Source:  http://www.bitjets.com/thelight2.zip
Win32 exe:  http://ippa.se/games/the_light_2.exe