Very nice game so far! Some ways how it can be improved (other than giving the game a proper tutorial) are:
1. Having multiple rooms to choose from (i.e., being able to choose if you want to heal or fight enemies to gain a reward instead) would add some strategy to the game and make the game much less rng-reliant on what rooms you get.
2. Add a shop mechanic that you have a chance to find every time you enter a room. You would earn gold by beating rooms with enemies.
3. Add a one-time-use health/mana potion that can be used anytime.
I hope this feedback helps and I can't wait to see the development of this game!