Hello,
Thanks for the feedback! I'm not entirely happy with the difficulty level either, but I do think the game isn't far off the difficulty level I'd like. I'm comfortable with the game being decently hard. However, we're planning to add more progression mechanics so you can level up and get stronger between runs, so hopefully that helps remedy the feeling of frustration when you lose.
Additionally, once we get combat stats and level previews into the game, you'll be able to make better decisions about what to take with you into each level.
Hope these changes will do something to address your concerns, even if indirectly. Cheers!
- Dpodz