This game is very endearing and cute with the art and the music. Maybe it could've been made even better with quirky sound effects e.g. a "PCHOOO!" for the rocket or something? In general, sound effects and animations could have made the cards more satisfying to use.
Speaking of which I like how this game uses the turn-based card mechanic, and combined lovely music and peaceful sky background, it makes this game a relaxing, fun experience.