While Nintendo is busy hampering the momentum of homebrew developers on the Wii, it's business as usual for the scene with the Nintendo DS. Programmer T4ils has put out a v1.1 update for StillAliveDS, his popular 2D remake of Valve's first-person action/puzzler, Portal.
In addition to general improvements and bug fixes, the indie game now features an in-game level editor! The video above demonstrates how easy it is to lay out and test your own stage. After you've saved your map, you can even upload it to the online Custom Game Directory from your DS!
It's strange to see a homebrew title implementing such a relatively advanced feature (for the DS) that only a few commercial games support -- Picross DS, Advance Wars: Days of Ruin, Mario vs. Donkey Kong 2: March of the Minis, N+, Steal Princess, and Bangai-O (sort of). If you have the tools necessary for loading homebrew games on your DS, you should be playing this!