You are light on your feet, and possess the remarkable ability to use elaborate, irrelevant, and down right impractical feats of acrobatics to avoid danger. 

You gain a climbing speed of five feet, unless you already have a climbing speed, in which case you gain a +5 to your climbing speed. 

Once per long rest, you may use one of the following abilities. 

• Wall run.  at the start of your turn, you may move up to twice your movement speed while leaning against a wall or other flat vertical surface. While moving in this way, you do not provoke opportunity attacks, and are not hindered by difficult terrain that pertains to the ground.
• Rolling fall.  You may, as a reaction, curl into a defensive position before you hit the ground, negating all damage caused by falling, and knocking yourself prone. This rolling fall does not protect from falls higher than 15 feet, instead simply halving the taken damage above that point. 

None of these abilities require an ability check to perform, unless you are wearing heavy armor or carrying a heavy weapon, in which case you must make a D16 strength check. On a failure, you fail to perform what you were attempting. failed attempts do not result in the feat needing a recharge. 

This is not good. The 5-foot climbing speed is worse than just climbing normally in most situation. The first bullet point would technically let a PC move up to 4× their speed in a single round if they dash. The second bullet point would only ever reduce any fall damage by 1d6, and it takes away the normal opportunity to roll an Acrobatics check to avoid landing prone. The last paragraph is poorly written. Finally, the phrase “once per long rest” is a DDB shorthand way of abbreviating the way WotC writes things, not official language at all; and they only use “may” when giving the player permission to do something, like during character creation. They use “can” when explaining what the character can do. If I may:

You gain a +1 bonus to your Dexterity score to a maximum of 20, and a climbing speed equal to half your walking speed.

In addition, you can do the following:

• Wall Run. As an action you can make a DC 13 Dexterity (Acrobatics) check to run up any solid vertical surface up to your walking speed.
• Tuck and Roll. Whenever you fall from a height of 10 feet or greater you can make a DC 13 Dexterity (Acrobatics) check to reduce your fall damage by a number of d6 equal to your proficiency bonus, and then spring to your feet.

You have disadvantage on these checks if you are wearing heavy armor or wielding a weapon with the heavy property. Once you successfully use either of these abilities, you cannot use either ability again until you finish a long rest.

So you put a level gate on it.

monks 9th level unarmored movement can be used as many times as you like. This feat is extremely limited.