Good job on getting through the tutorial, I think now you can focus on adding some flair of your own.
While playing I was thinking that it would be nice to be able to go a bit quicker. Maybe holding the down arrow to crouch and speed up a bit. You can easily achieve that just be reducing the friction on the character to a certain value over time, and when you stand up, slowly return to the standard value.
A bit of UI would also go a long way, just a simple "restart" button once you reach the end, and a "start" button to start for the first time. I know this is just a test but adding some UI elements would really change this from "tutorial project" to "something of my own".
Keep it up! And let me know if you ever expand on this, would love to see it!