This is Mark of the Old Ones, a physics adventure-platformer with a Lovecraftian twist in which you're some sort of a tentacled abomination. Watching the trailer I'm reminded more of Gish than anything.
A really pretty, horror-themed Gish. It has an ongoing Kickstarter campaign, if you're interested.
Aside: the page has some of the coolest headers I've ever seen on Kickstarter.