Wow that's quite a lot of stuff you drew there! I would not buy it because for me the quality is not high enough. Don't forget the hand drawn style in games has a very personal feeling to it, and I think many developers using the hand-drawn style usually wish to express themselves by them self. Anyway you earned yourself some respect! I'm sure this alone leveled up your art skills and if you re-did it now it would look 2x as good. Maybe try ink?

this shows good planning skills but the drawing ability and animation is very poor. Also your display picture is ridiculously bad. I make games professionally and this would never fly. One thing I do like is the idea of this drawing style being a deliberate choice do make a very unique look for a game. Maybe consider re-drawing these assets in digital format.