$12256 / $11500
Congratulations for the game, you are making a fantastic job.
But, image tearing is ruining the experience while playing this game on linux, you should implement vsync.
This issue is not there when running the game in Windows 7, just a little bit of jitter when the scenario scrolls.
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Vsync in SDL 1.2 only works when using OpenGL (which we aren't using). Unfortunately it's not something we can solve easily. The options are all drastic: wait until SDL 1.3, rewrite everything to use OpenGL, rewite everything to use something else (e.g. SFML).
Well, whatever is the option, the game will benefit a lot from that.
I guess, at some point, it should migrate to opengl.