u/Ambitious-Sink-5761

It was probably a Flash game. The images appeared to be pixelated.

The protagonist entered a capsule-shaped machine and moved around, extending a claw upwards or to the left or right to hang. It was a platform game where you had to escape the map without jumping using this mechanism. The maps were arranged in stages. The background was a dark green hue, giving it a sewer-like feel.