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I noticed that all creatures have a very high damage/hit point ratio and there are no ranged units, which is a weakness. However, creatures of levels 5-7 can be stronger and this can be compensated for, for example, by their cost or number, which will be a unique feature: they can be easily taken down from a distance, but once they get close, they become a real threat.
Addition:
a speed of 7 for units that are supposed to outrun light units is too low.