Tekkyuuman is an excellent platform game by the highly prolific Japanese developer Ikiki.
"In this game, you must make your way towards the green spiky object and smash it with the flail. Use the control key to swing your weapon and tap the left shift key to jump. A wall jump can also be executed by pressing the same shift key when scaling up walls." (IndieGames.com description)
There is a full video walkthrough of this by Terry Cavanagh up on YouTube, as follows: