Spyman (スパイマン) is a short platform game by independent developer Ikiki. You play as a spy, and infiltrate a facility populated with standard Bad Guys, complete with sunglasses and guns.
Despite its short length, there is quite a bit of room for neat tricks and shortcuts, most of which are detailed here.
You can also watch a TAS of another game by the same developer: Nikujin.
Read the submission notes here