TI 'em Up

Another small game: My entry to a TI mini competition: TI em Up

Requirements: 160x100 size, 4 scales of grey

It's a horizontal shooter, no story needed. Important: Make use of the different weapon systems!
There are four stages with bosses and a tough difficulty!

Boasting hand ripped music from C64 games by Chris Hülsbeck.

Updated to allow configuring of controls and bigger upscaling.