Ok I just completed it and it took me about 50 minutes so I guess the time is fine
Though level 1 and 3 are pretty small I really enjoyed level 2 but I don't think it's necessary to inform the player the expected damage from the final boss, I'd find more rewarding if I were to discover the best route since you basically told me to get lot of health. In my route I didn't take all Atk gems because of this and I expected to be more yellow doors on level 3 so I'm not sure of how many possible routes there are. It's not a bad thing, but maybe more choices on level 3 might be good but I see that you did this hold in 45 minutes so good job!
Status before the boss:
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HP: 2263
ATK: 77
DEF: 42
GR: 433
REP: 673
KEYS: 4/0/0/0
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There's not some other world out there where everything's gonna be okay.
There's just this one, just this rock.
-33th Skywatcher