Considering that Corta's platformer it looks quite horrible
I highly doubt if you can create anything decent alone since all work mostly just models environment and animations while the game itself is not really important part.

If you still want to do something like that I would suggest something very straightforward and short what you could finish in 2-10 minutes without repeating same scenes and same animations.

For guro and sex game something like TROLLFACE QUEST or stickman series or Stupidella games would be very interesting and fun to play and not that hard to do.

Considering animations the easiest way to create graphics is 3d rendering you can use DAZ or MMD. You can also flatten them to turn into 2d
Painting everything by hand is quite a hard job even for a good artist.