I totally get what you are saying, the first jam I did two years ago I leaned heavily on course material but this time I just went from memory (and google) and did 100 hours in a week (18 on a Sunday) and it just flowed, and its a great feeling when you don't feel tethered to course material anymore.
I would really really really like to see you expand this with a stronger terrain, more fog, different health bars etc, you have the game mechanics sorted and you clearly have great artists involved, I don't think its far from a commercial release (not that I have done one yet). It could be the next V Rising.