I don't think infinite rage is overpowered on any of the non-throwing weapons or bows
Ice Sword and constant dashing is OP against all enemies. Even the dragon is kept frozen most of the time. Lightning sword is also a killer due to huge lightning damage. With gold arrows bows are also OP. The hammers are mostly useless though.
I'm definitely finding the mjolnir the most powerful weapon at the moment
Me too. But it's Mjolnir, a divine weapon afterall
I considered using a slower animation for throw thus slowing the rate, but it wouldn't be so much fun anymore.
I also considered lowering the thrown damage (i.e. keep 25 damage for melee attack and have something like 10 for thrown Mjolnir), but I feel like it would only make the battles longer while the player will still keep doing the same thing (evading enemies and throwing it around). I feel like it wouldn't make the battle more challenging, just boring.
I think I'll just leave it as it is. As more weapons are added to the game, you will be less likely to get Mjolnir often, so those runs when you do will feel special.
If you have a bomb or escape scroll, you can drink your potions, start a battle...
Actually I hope more players discover and use that. It's a fun, creative way to use the game and bombs are so valuable for other things you can never get too much of them. Escape scroll is really rare and drop count is limited.
BTW, I envision the final game to be more like The Binding of Isaac or Spelunky than old-school roguelikes. I.e. a skilled player should be able to beat it 90% of the time, but the real challenge will come from achievements and quests - some of which will be really difficult. And speedruns.
The other thing is that levels should get harder after the castle (which is mostly easy due to goblins and guards fighting each other). On the next level (dungeon), you will have a horde of escaped prisoners (thieves, rogues) on your hands, and after that come the catacombs with really dangerous skeleton mages and a necromancer.