After some practice, the crouch jump becomes intuitive, but it's very hard when you're not used to it. It also took me a while to notice you can keep running to run faster.
I'm not a fan of having a score at the end. I think most people will have a negative score at the end, which doesn't really feel right and I would prefer on the end screen to have the different figures, especially the in-game time.
I noticed that the character goes way faster when moving in diagonal and it makes a big difference. It's quite useful for speedrunning :)
Here is my speedrun of the game: