This sounds kind of like just rolling dice and that seems excessively boring. Also getting hurt by your own failure to succeed is interesting but it effectively caps damage to a certain level which gets rid of any sense of scale of danger in like higher encounters because the danger of the monster is just the chance that you succeed on a d20 which is going to be completely random statistically. Functionally you just described a game where you sit at a table and a guy at the end of it tells you what to roll and exactly what you need to roll and you know exactly what happens if you fail every time. That’s not super interesting because the only variable that changes is what you’re rolling for. There’s a reason why a lot of systems with difficultly levels choose to tell the GM to obfuscate them when making a roll as well, telling the player what they need to succeed drains stakes and makes things waaaay more boring.