Gravortex

Gravortex is a 2D version of the Portal concept. In 20 levels all played on
a single screen, the player needs to make a character reach a door. To do so,
portals or gravity vortexes can be used. The left mouse button shoots the
starting vortex, the right one launches an exit. In order to launch a vortex
in an area, it needs to be in the sight of the character. A WASD-setup is used
to move around and the space bar removes the launched vortexes. Levels are
usually based on puzzle-solving, with crates, buttons and doors, but some also
require timing and quick reflexes.

Gravortex