That was cute! Zero problems just getting going jumping around, very smart to have both the space bar and up key for jumping. I love the little button friends and that they don't hurt you, and the shifting lineart on the player had a lot of charm and would be neat to see more of in later polish.
At the start I was expecting jumping on the button friends to have an immediate effect somewhere in the level (like the floor switches do) but once I caught on that their click effect was to pause it made sense as the first kind of button friend to meet. There's going to be a lot of cool and fun things to do with them that makes me excited to see you keep working on an exploring this idea!
The timing of the final two doors was the trickiest bit, feels like either the door opening is a little too delayed or the button friends could stay paused a little longer.