I guess it depends on people needing it or not in their games, that is probably the case for all characters ? but I understand it can bring feelings down when something you make does not seem to be successful.
I did download it to check closer with the default character from mz, you did a great job in my eyes.
For the slimes I guess it is to be expected to get less downloads when something is not free, from video it looks great. I am sure it can come handy if anyone wants to make a game with slimes heroes.
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