I'll register just for this.
1. It's fun. Fundamentals are solid.
2. Do not explain anything! It's not punitive, discovery is natural and part of the fun.
3. Training turns the dungeon shop into a noob trap.
4. No need for spells and abilities (hello Loop Hero), I would advise focusing on exploration instead: more room / monster variety. Focus less on how to kill monsters and more on wanting to know what's in the next room - while caring for survival.
5. Restarting from scratch is eh, so if you could add a boost in luck / xp up to the highest level reached in previous runs, that would be appreciated.
And as a preference, make town portals as scarce as possible. Right now it's just a pitstop; I enjoyed when it first seemed like an oasis.