Concursion

Concursion is a multi-genre game played on the boundaries between games.

A tightly controlled, high-speed platformer at its heart, Concursion has you steer your hero through a dangerous interdimensional world, switch between different classic gaming genres on the fly, and pull off feats of tight aerial acrobatics otherwise unattainable in one genre alone. Imagine transforming from a platformer to a space shooter to a jetpack pilot all within the space of a minute.

Basically, we take a handful of classic video game genres, smash them all together, and let you leap between them, remapping your controls, shape-shifting enemies, and even blending the variant soundtracks on the fly.
It's one hybrid high-speed tightly-controlled platformer mess. :)