Well this was really interesting to play!
It feels like a narrowed down, refined version of Dungeon of Dreams 1. Where the first was more kinda Minecraft like with almost every block being destructible and there being multiple enemies scattered all around the map. This was far more laid back, less grindy, and more focused on an almost puzzle-like exploration. And frankly I think it was a good direction to go in!
It felt very chill, but I still had to keep track of my items, and I liked that the map was an item that had to be picked up first. The exception to this vibe of course being the unexpected boss fight. Where I decided against buying bombs and got wiped instantly lol. Fortunately you added a respawn point which is nice.
I also really appreciate the addition of a speed upgrade. And I like how the player is rewarded for being inquisitive in the first stage of the game and exploring, but without being told that they were actively prepared for a boss battle. I assumed it was going to be a score of how much loot I found before escaping.
As for the fight itself I thought it was a bit rough at first with the attacks doing damage over time to the player. But once I figured out the boss's move set I think it actually balances out quite well.
Also as an extra note, the main menu is surprisingly polished!
Overall I thought this was great, and I applaud you reusing stuff in the sequel to your last entry, but using them for a game with a completely different feel!
Excellent work!