[These are the only supported resolutions from the command line.]

Not sure if you are running on a Mac or not, but this post on the blog still seems to be relevant to your issue concerning resolution mishaps from the Steam command line.

Resolutions

-640x480 Sets the game to run at 640x480
-800x600 Sets the game to run at 800x600
-1024x768 Sets the game to run at 1024x768
-1280x720 Sets the game to run at 1280x720
-1920x1080 Sets the game to run at 1920x1080

These are the only supported resolutions from the command line.

Hey all.

So I got this game through Steam as part of the latest Humble Indie Bundle, and I absolutely love it. However, I experienced some graphical glitches during the CH3 boss level, Brownie. For one, the rising salt at the bottom of the level is a black buggy mess. Brownie also appears to be moving in slow motion, and shouldn't make it to the end of the level.

And while it's not a huge bug/issue, my level select screen animations all move very slowly.

I'm running in 1280x720 resolution in fullscreen using the command line "on launch" options.
I have a 15" MBP,
Intel Core 2 Duo
2.53 GHz Processor
4GB Memory