Haha this is so great Gen. I love the expressions of the characters, they're very telling and very sweet, as is a trend in your work usually. I think the goal and the input/intent of the game makes sense here, it is very clear to players what they need to do, even if they don't read the directions they can pick up on it as they keep pressing space. The music also complements the game really well, making it fun and casual feeling, along with the sound effects and the hearts that appear after a kiss.
In terms of critique, I would try to spend a bit more time looking into fonts to use for the game and also trying to visually consolidate the user interface elements. For example, having the drop shadow behind the thought bubble be the same depth as the drop shadow behind the sliders would make these two elements feel as if they are part of the same game and not assets ripped from different sources. This correlates to color choice and outline with user interface as well, the sliders on the bars are good but the white outline makes me feel as if the element is from a different game than the sliders they are meant to work with.