A pretty neat and original idea. I loved some of the wacky stuff that I would receive--there were many surprises in there, and figuring out what I could stack on what was fun.
I think that, for the purposes of this jam, the left click and right click would have been best mapped to keyboard keys (e.g., Z and X, or J and K). Clicking the mouse doesn't feel as authentically "Gameboy" (even though the game genuinely looks the part!).