I tried to leave this comment on YouTube but it mysteriously went bye bye. So, i'll post it here 🙂
Hey there! I’m Gemintronic the developer of those two games. Thought they were destined to be cart only so I was surprised when I discovered they were on the VCS storefront! Hopefully more actual 2600 games get the same treatment. All the code, graphics and sound were done my me. Some screens in the hardest difficulty of Retro Game Quest are procedurally laid out. However, all the room layouts in C@tacombs of Chaos are procedurally generated. A little ashamed that some aspects of our games require reading the manual. Pick up and play is a hallmark of pre-Nintendo gaming. In Retro Game Quest when the timer turns purple you can press FIRE to fly through walls. Also, the red bar at the lower left hand side in C@tacombs is your life. If you pick up a potion you may press FIRE heal your HP. I reached out on Facebork if you have more questions 🙂