A good start
A promising start, I believe someone has said that the jokes were a bit unoriginal but I'm sure you can work on that, I find I'm at my funniest when writing with someone else, compiling ideas into one joke, maybe give that a try.
Aside from that the concept is relatively promising, three guys and a rat in an apartment. I would also recommend trying to change the voice for either the guy with the green shirt or the guy with the red shirt, as they both sound and look quite similar (I'll look like a real idiiot if they're actualyl vocied by different people).
It hard to say too much this early on in a series, btu keep it up and it could be good.