You may have to double click the green flag. Use the arrow keys to move, and avoid the rocks and stalactites. Springs make you jump higher, and mountain streams make you faster.
Thanks to yotacopaco for the game "Platformer Tutorial" which is where I learned how to make a platformer, and where I got some of the code. yotacopaco: https://scratch.mit.edu/users/yotacopaco/ Platformer Tutorial: https://scratch.mit.edu/projects/456860924