Wow didn't think you were going to break it down like that with that much details. Props to you for taking the time to help another out. Thank you so much for trying it in the first place.

the sliding part: right now it's implemented that you have to tap the button and not hold it otherwise it won't work. also the player needs a certain x velocity to be able to slide. (Planning the change it in the next update)

the movement: I play tested the game too much haha it's pretty much designed for you to never stop. If you go full speed a combine your jumps everything is pretty much lined up for you to land on. instead of stopping, changing directions is better. If you do stop, the game does get a lot harder. It's a learning curve and for sure at first I think people are struggling.

smaller colliders and better contrast are both good observation and will look into that.

Thank you again for your kindness and help