Since it doesn't show details on this page and I know some genius is going to wonder why they can't do anything, here's the description copied from the main page:

this isn't really a game yet

it's just my progress on building up the basic components

if you left click an object that you have a clear path to, you'll possess it

right click an object that you have a clear path to, and it'll open a menu of available actions

jump (space) out of objects you've possessed