Good. Way too good.
Very creative design. Astonishing graphics. Amazing SFX. Awesome music. I have nothing negative to say about this game :O
EDIT: Actually... I just found one. It's the last level. I have got a feeling this is unintended but the last level can be solved by just burning and pushing the right barrel. And I think the level design in particular can be way more compact -- I think there are way too many unnecessary terrains in the levels that just clutter the screen. However, the puzzles themselves work awesomely -- and it's still a very impressive game you made in just a week.