Thanks for the long actual feedback. I really appreciate it.
Speed ends up killing you is fair, but I'm not really sure how I can balance that with this being an endless runner where you should ultimately crash and die. Sword charges are one of the available upgrades, but 3 max might be too few. I can add an upgrade to get more.
Adding some more fun to the roads, be it background elements or a tentacle hugging her butt would be great, and is the kind of polish the game needs. I can probably get something in there.
I would like to add some more crossover characters, and more 'events' in general, but I am trying to get this game into a "finished" state. A couple more are coming and half made so we'll get some.
A variety of endings are coming in the next update.