Jostle Parent was made in collaboration with Unwinnable for their Playable project. It was written in Haxe using the HaxeFlixel library. The music and sound effects in Jostle Parent were made with a combination of bxfr and Audacity.
You can read my writing about Jostle Parent on my blog or even read the Jostle Parent press kit. Jostle Parent was covered on Offworld, Kotaku, L’OUJEVIPO, Kill Screen, Superlevel, and Forest Ambassador.