The Good: Character animation was top notch.
The Bad: The big problem is in the writing, pacing, and presentation.
I am not familiar with your comic strip, but I feel like this was probably just a drawn out twin of one of them. The joke seemed to be trying to build up to some grand joke in the end, when what you really meant for us to find funny was the wordy speech the hamster gave and the big deal he was making. That might work for a comic strip, but you can only get so far with a contained situation like that. If you do, then the actual script has to be funny, as in the protagonist needs to make the jokes happen and not just overreact.
This goes hand in hand with pacing. You need to get a little smarter in terms of what get's said and how fast it needs to be said. Because your voices don't have a hook quality (i.e why Salad Fingers can talk so slowly yet remain so popular) you need to speed up the delivery and pick less wordy sentences (I'm referring to the script outside the purposefully wordy bit) Having white hamster say "Hey joe" twice, having brown hamster say "I've done it" twice and so slowly breaks any chance for momentum.
Lastly, this is not a single panel comic strip, and so we as an audience of animation expect more variation in the world you set your flash in. What you have here is a single, simple, background, which when compared to the effort you put into the character animation, seems half-assed. An animation needs to take you places. Close-ups and spinning clouds will only take you so far.