I am extremely impressed by how insidiously clever the puzzles are! It's very difficult to design puzzle maps of this quality, and they make players feel really proud of themselves when they finally solve them. The fast difficulty ramp can make some drop out early, so I recommend a system where three levels are unlocked and solving any one of them opens up a new one. This would offer options to those stuck on a puzzle and incentive to revisit a skipped earlier levels later in the game (but it will likely require a couple of new maps in the pool).
I like all of the art in the game, the interface and gameplay elements are very practical, clean, and clear. The robot is cute with lots of emotive expressions. I love that the sexual content is directly linked to the gameplay in a brilliantway. The sound design in perfect in its simplicity, this is the sort of game that works even without music!
I feel that the story could work better if it's a bit more spread out. I quickly forgot it and focused on the game and only got reminded again at the very end. Maybe the robot could tell the player a single sentence at the start and end of each level which together build the same full narrative that you have in the game now.
You have a real talent for designing elaborate puzzle maps with interesting solutions, I really enjoyed them even if I had to cheat on the last one. Very well done, wonderful work!