I'm a strong believer in "show, not tell" when it comes to video games on Kickstarter. I've said this before, but making an attractive prototype is really not that hard, I've made many, and it's really like distilling game development down to only the fun part with little of the grind part. You get to do the fun stuff, see the results, and show it to people but without going into the real grind of getting all the connective tissue, balancing, and content in general done. So, particularly when dealing with a 2D style game like this, there's no excuse to not show a decent amount of gameplay. You want us to take it seriously enough to give money, then you should take it seriously too.
Oh, and video game KS, in my opinion, should always *open* on the gameplay. If you want to sit around and tell jokes, do it afterwards. That way I can bail and people who came to the video game section of KS for jokes can get what they came for and everyone wins.
All that said, I like RCR and I'd consider backing this if they showed more game.