Yeah you're right! It's actually cool that there's much rng involved, but i guess just a tiny buff to the upgrade encounters would be fine. I'm very stubborn, and I really want to know the full lore and story, so I'll just keep playing 'till I make it. That should tell that you made a really cool and special experience
I really appreciate that you've decided to keep playing! I shouldn't say this, but the game actually secretly adjusts the percentages to help the player, for example by increasing the chance of shops appearing every time an enemy is encountered in the room where the shop can spawn. I'll try to further improve this aspect and general balancing in the upcoming updates, thank you for your feedback!