Painter is a loose remake of the classic ZX Spectrum game, Painter. You can download all 71 of the Crozza Remakes here.
It's loosely based because we have a Wreck-It Ralph at the top throwing things at you making it more difficult. The game itself is only slightly more difficult than Pong, so it's not for everyone but most likely appreciated by anyone who owned a ZX Spectrum.
F4 will switch from full screen to windowed mode.
Painter is portable, free and a decent little retro time waster.