For anyone interested on a GBA version of the rom: http://gameblox.net/gba/DontCallMeMamaV2(2).gba (identical to DontCallMeMamaV2 (2).gb, this is just a simple conversion).
Press L+R to change palletes (scroll to the first one to get grayscale, and the second for shades of green). You can also save/load states on your actual device. PS: I tried to use bit ly but itch.io wouldn't let me.