Space Invadors simulator for the Gameboy Advance
and also the Gamecube via the Gameboy Player and now the Nintendo DS (via the GBA Cartridge slot)..
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There have been some minor speedups due to the
video being reduced to 16color instead of 16bpp which makes
quite a difference in addressing times (up to 4x as fast).
We've lost the backdrop because of this, but not to worry
because good old gba has several layers we can use!