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What device are you playing on? I have accidentally figured out that playing in a narrow browser window hides the right side of the board without any hint it is there (except for the health bar being cut mid-heart - I have initially thought remembering whether you already have 15 hearts or not was part of the game process). This partially visible/explored board might be the reason you did not get enough resources for lvlup

I played later, still I thought perfectly, but was 4-5 hearts short. Then I played again and cleared the board with 2 hearts to spare, and another time with 1 to spare. I've scored 303 and 302 points. It might be possible to score higher by getting really lucky.

I think it's about delaying using the heart-healup as long as possible. Use them at later levels, not earlier levels, whenever possible.

Gotta get the gnome and mines earlier in the game to get more juice out of the hearts

The rat scroll removes points from the board (replaces monsters with 1hp rats).

Does it? I thought it just revealed the rats

Huh, now I have to check.

The rat scroll reveals rats.

As you find rats, they are facing towards the rat king, which helps you locate it, get the scroll, and reveal cheap kills.