One Room executes the feel of a movement game well. The motion is simple, fluid, and satisfying. Additionally, the swift restart upon failure keeps the player in a good flow. I would love to see additional mechanics besides wall-jumps, like a slide for low gaps or a wall-break or something, but what you've made is definitely a solid base to work from.
The game jam's 'One Room' theme felt more like a limitation than a theme for this submission. Would have liked to see something more creative done with it.
Good contrast between the avatar and the environment makes the game easy to read.