I also put together a Portable Intellivision Development Environment to bypass the issue of not having time to sit down at a computer and bang out code for hours at a time. Everything I had done, I documented and am sharing with anybody else who might benefit from it.
Besides create more games, my latest Intellivision endeavor is to hack some of the ROMs. I patched Tron Deadly Discs to correct the colors so Tron is now the good guy and the Sark warriors are now the bad guys. I also put my knowledge of the Executive ROM to use and easily eliminated all the Nasties in Vectron. Of course, I'm sharing my patches with whoever wants them as well.
In a few months, I hope to get a new tablet to replace my old one. At that point, I plan to record the whole process of my following my own documentation and installing the Portable Development Environment onto the new tablet, and sharing it on YouTube. There are other tutorial videos I hope to put together that might be of some use too.