Thank you for the detailed review, I'm glad you enjoyed it!
I do know of the performance issues, and you are correct that the major issue has to do with how high resolution the textures are. The implementation for the cum decals was the best I could do at the time, but really puts heavy weight on the performance. Overall, the game is patched together with what I could do with my knowledge at the time. While it's a 2D game, it's technically 3D rendered, and I may be able to fix that.
When I get to working on this game again, I would like to go through and lower the res if all the textures, and see what other optimizations I can do. I've been focusing on other projects along with the artist being busy, but when I do get time to finish the game off, I'll poke him to see if we can get it finished. I have no ETA for that, but it will be months at least.
It's possible I could release a quick performance patch for the demo. I will see if I can make time sometime within the next week or so! It's long overdue and I apologize to everyone for that!