I'm giving you a Three...
...for many reasons: One, this is your first-ever Flash, and I think I can allow for a little leeway with first-timers, as I have yet to even try myself; Two, I've seen things where I didn't even understand the bodies of characters, let alone the plot of it; and Three, you tried to draw something other than just sticks, and for a first try, I have to say that this was pretty good. You even went out of your way to draw in backgrounds! Just practice a lot more before you submit something like that, because unlike me, everyone at NG's a critic, and usually all they can see is that you did a bad job, and therefore, it turns into: "OMFG yuo SUXX0rZ Im Giveing you a 0 Bleam thes piece of shat". Not to criticize everyone on NG, It's just that I seem to end up seeing a lot of people like that doing reviews and blamming artists that may just have potential. So don't let this get you down, and I know you'll do better in the future, if you continue to practice and remember to try new things!