@tinywhitecat You shouldn't be reaching any impossible points. A couple things that could help your game: 1.) Look ahead to the best of your ability. Your immediate placement between spikes will have a bearing on subsequent jumps. If you're given room in between spikes, you can slide down a bit before making your next jump. 2.) You have a little control over the height of your jump. Holding the key down will take you higher than a quick tap.
I just tried playing this on my wife's ancient netbook. I could only see about half the playing field and the Flash was laggy. Made it pretty hard to get anywhere.
I've been playing almost daily since January. Every now and then, despite not feeling like I'm doing play has changed, I notice my average score jumping up about 150m. I used to think I'd experience some eureka moment where I'd "crack" the game's secret, but I've come to the conclusion that it's all about improving reaction time and coordination.
I've been having pretty decent 5,000-6,000 for a couple weeks now, and then I started having 10,000+ games for some crazy reason. There was no transition or gradual increase of top score. I had my first 10,000+ game yesterday, and I've had three since then. Nothing about my playing has changed, as far as I can tell.
 "ESCAPE"){kind=icon}
 "Portal: The Flash Version"){kind=icon}
 "Canabalt"){kind=icon}