decelerationTime: How much time (in seconds) an character will take to stop completely from maximum speed.A value of 0 will allow the character to reach maximum speed instantly accelerationTime: How much time (in seconds) an character will take to reach maximum horizontal speed.

maxSpeed: The maximum horizontal speed the character can reach.

The main classes used in this project are the CharacterData, used mainly for attributes and other adjustable values, and the CharacterController2D, which handles all the movement and collision algorithms. The base classes of this project can work Unity 2017.1 or higher, but 2019.4 or higher is recommended.

Throwable objects can become stuck to walls if inside them when released.

I'd stick to using only climbable angles (configurable) to avoid problems.

Slopes are still not perfect, specially 'slide-only' angles.

Fixed animation errors and added sprite example, art by rvros.

This approach makes use of raycasts and manual calculations to deal with movement and collisions of an character in the 2D platformer world in a simple way, while also allowing you to easily change values to tweak how it behaves.

Sometimes, however, you might want a more precise and controlled input and movement, rather than a realistic one. The Unity engine offers very complete 2D physics features that allow you to create realistic platformer mechanics easily. There are some different of ways of implementing character movement and controls for 2D platformers, each with its own pros and cons. 2D platformers are one of the first and most widely used game genres, dating back to 1980 and having been adapted and combined with various mechanics and clever twists throughout a large number of titles since then.

Unity character controller source code