Thank you for the very good video about Dr. Dangerous. The game should remind you that there weren't always checkpoints. Many games are hard but I never liked that you could die your way through the levels. I kept the levels smaller because otherwise it's very frustrating when you have to start all over again. I don't find the challenge so difficult that you have to throw the joystick directly against the wall like in Rick dangerous. That's why I included the level codes, otherwise the game would be too difficult ;) My latest game will also be without checkpoints, but not quite as difficult. So let me surprise you.
I also have a lot of ideas for other games and not just platformers (my favorite).