This might be the best game of its kind. You've avoided the usual pitfall of having a million simultaneous abilities and effects to keep track of. There are still a lot of options and possibilities, but you've made it easy to focus on the task in front of you on a turn-by-turn basis by not letting the rules and special cases get out of hand.
Still though, I'm not giving it a 5 because I was so upset to learn that my Natural 20 and Last Wish achievements didn't get saved. It's one thing for them to not get unlocked immediately because the Newgrounds session expires, but I thought because you're also saving redundant achievement state in the game's own save data that I could unlock the achievements automatically when I reloaded the page. However, I found that the redundant save data didn't get saved either, so I don't know if the save data is tied to the Newgrounds API or what.
A few minor points: I keep forgetting I can use the eyepatch to reroll ones, the music is randomly muted when starting a fight, and the enemy growls sound like a toilet flushing.
Hint for Last Wish: most fights are easy enough, but the last few before the church will give you the most trouble. Try to plan ahead and pick a path where at least the final two locations are non-fights