Looking good.
For a first flash movie, this is very promising. The fact that it's Calvin and Hobbes makes it even better (I'm a massive fan). You hit most of the nails on the head. The illustrations were pretty decent, the pace was well set, the dark and dingy atmosphere was created with talent. What makes this somewhat cooler is the fact that only about 1 or 2 days ago I took this very comic strip as part of an inspiration and influence to a school (or college) art project I was undertaking. However, why's Calvin got a French accent? I may be wrong, but judging from your slightly clumsy (no offence) wording in your summary and the fact that 'Cristian' (very French/European name) showed you the 'ropes' indicates something of a European nationality within you. I'm half French, so I'd be shamed if I couldn't pick these out, though albeit it's not so difficult. Unless I'm absolutely wrong. If I am, apologies. Anyway- Calvin and Hobbes. Woo!
Anyway, congrats.