Magic Triangle

The 3 sphere fellas found a magic triangle to fly around in. Alas, colourful shapes are trying to take it back.
Are you a bad enough dude to keep your new triangle ride?

Use WASD to move and turn your shape. Space lets you swap the screen colours, revealing either the flying magic triangle, which lets you fly away from enemies, or the 3 spheres, who may not move, but shoot in the 3 directions they face.

Enemies also swap between modes depending on colour. If they are visible as a patterned square, they will accelerate towards you in an attempt to collide, causing your defeat. If the enemy is visible as a triangle with a narrow bar behind, it will instead try to shoot you every few seconds. 

Shooting an enemy grants 5 points; keeping them alive grants 1 point per second.

Made for Trijam #140(theme "Optical illusion").