It's just Goblins Strike Back but with less everything. Less complexity, less content and too overly simplified. At a glance this would have been a relatively decent game if it was the first one, but it isn't. Its just literally a direct downgrade to the previous game. While GSB was interesting because by design its a roguelike puzzler that required you to minmax your resources with each randomized map, this game takes that concept and simplified it to as simple as it gets: three room choices each filled with an extremely specific thing and thats it.
Goblins Strike Back had actual map design and gave you opportunities to get more resources, spend resources for other things, or outright avoid everything when possible. In this one you really cant avoid anything, are getting boat loads of resources by theme (magic rocks, water and bottles, nothing but weapons/food, etc) and don't really have much choice over anything else. You're given 3 rooms and they're randomized to, as mentioned already, very specific themes and you just pick one room and thats what you get. Sometimes there can be a rock or something between them that you can remove if you have the right resource to gain access to the adjacent room and its loot.
Overall it's a relatively decent game to introduce people to this genre of weird roguelike puzzler but when compared to the previous game it just has way less going for it. Less girls (like 8 in total vs GSB's roughly 20 or so iirc), less puzzles, and its still just as grindy as the first game with an astronomical curve. If you find yourself enjoying the time sink as per the game's design then just make the switch over to Goblins Strike back. It's the same thing but better.