Jostle Bastard was made in collaboration with Unwinnable for their Playable project. It was written in Haxe, using the HaxeFlixel library. Sound effects were made in bfxr.
You can read my writing about Jostle Bastard on my blog. More importantly, you can read all kinds of stuff about the game in the documentation associated with the Playable project. Jostle Bastard was also featured on Free Indie Games, IndieGames.com, Indie Statik, Oujevipo, Rock, Paper, Shotgun, Forest Ambassador, and Kill Screen.
Jostle Bastard is and was a Flash game, so it’s now present via the ruffle Flash emulator.