Really fantastic idea! I love the idea of a physics-cased sneaky thief type game. The art is great as well and you overall set a good ambience of tension while collecting loot.
Similar to everyone else I did have a lot of trouble with registering my clicks so larger hit boxes would be a good idea for the items. The player's movement speed also seemed a bit fast for trying to carefully launch objects for me. This was not helped by the fact that the game was lagging quite a bit for me but I was playing on a laptop and with the web player so that is likely on me. Otherwise, really awesome entry and with just a little more polish I think it would be a ton of fun.