I think the tentacle sex part could have been barefeet.
Well perhaps a nude mode for the game that is hide/show clothes would be nice for Malevolent Planet 2D that way people can play the game in nudist mode though it wont effect the premise of the game and have your thought of redrawing the feet by removing the shoe during tentacle sex and replace with feet?
And also is it okay for the next level for Malevolent Planet 2D to take place in the nudist planet where female protagonist will visit there naked and interact with the naked denizens of the planet who are both human and alien , male and female and have sex with both she will also spent her time in the planet skinny dipping , sunbathing and frolic around naked in the nature of the nudist planet.