1. It doesn't say how the game starts, and how its turn loop works, I just used my previous experience with RPGs and assumed you start by rolling the d20 and keep rolling it turn after turn.
2. How the test work isn't very clear also, again used my previous experience to assume it's 2d6 + modifier and has to be equal or greater than the difficulty.
3. It isn't very clear also that the first ruler is success and the second below is failure, I assumed things by text interpretation. The text in front of the rulers confused me a bit.
4. After a few turns I just realized it's just about rolling a d20, then rolling 2d6 and hoping for being lucky. I started excited but then got bored after a few turns. Maybe a little agency could boost things a bit, maybe instead of modifiers each character have limited special skills to use by the player agency, or both, mofifiers and one or two skills.
5. Reaching near the game end I changed from a d20 to d6 or d4, 'cause I kept rolling repeated events and got the same numbers over and over, since by the end you'll have only a few options left. Maybe changing the events to allow repetition could make things faster.
6. In the end I got my second ruler fillied exactly in the final turn (failure), but I was thinking at some point that there's a high chance the game ends without any ruler filled. I would've assumed the ruler which got higher points would be the one valid in the end, but that would be just another assumption and not on the rules.
7. The artwork is lovely, but I think there's enough space in the sheet for a better layout and for increasing rules information and adding character skills.
Just suggestions, your work is very nice! Thanks for the experience!