Short, light-hearted story with a plot twist at the end is how I see Haruki's Magical Adventure. The soft pastel colored world and characters feels warm and goes hand in hand with the well written dialogs. On the other hand, there isn't much to say about the gameplay due to its Ren'py origin while the story has potential to grow if it carries on in its own fashion.
Magical Girl Concept: The game did not make full use of the Magical Girl concept as it is only depicted in a very short segment in the game. The character Haru has a Magical Girl sprite which is acceptable although there is no mentioned anywhere in the story that magic was used.
Mechanics: The game uses the stock Ren'py visual novel mechanics and no additional mechanics were noted.
Visual: The character arts and CGs were done really well, with the color choices being in the soft pastel region suitable for a really warm and loving story. Although it is said that the art assets were made during the game jam period, one thing I wanted to point out is that the location backgrounds may have come from a stock set from somewhere so I hope the developer could clarify the assets used since the game does not have a credits list of where the assets could have derived from.
UI: Nothing to say about the game UI since it uses stock layout and design from Ren'py.
Audio: There is no trace of audio played throughout the game. The game could at least have one BG music even if its from a stock set.
Theme: The magical girl theme isn't heavily emphasized or utilized in the story. It feels like the story could have its own bearing without the Magical Girl element. (Spoiler Alert! Start) As for the side theme picked which is uncertainty, the game did not truly make full use of the theme since the idea of uncertainty is pretty much diminished with only one possible ending in the game. I have tried each possible options but the results made certain there is only one path in the game (Spoiler Alert! End). Also, the surprise/uncertainty aspect of it was spoiled from the description in the itch.io page, before I even started the game, see notes below.
Challenge / Engagement: The game did not pose any gameplay so there is nothing to be challenged. I would say the story is well written which is engaging as it appeals to my inner warmness, wanting to see more of the plot movement between the two characters and how their lives would progress as they interact with each other while their environment changes over time.
Originality / Creativity: The character art and design is really unique in its own way which suits the direction of where the story is going. In terms of creativity, the dialogs written for each character feels real and have their own touch of personality to it. There is a good amount of harmony between the two during their conversation.
Story: The game truly emphasizes on the story as the main aspect of the gameplay itself. The dialogs has been though out pretty well with some nice big words, no typos or grammatical errors, and feels natural. I find the story a little short and cuts into the end very suddenly. Hence, there is a lot of possible content that could fill the voids in between the present story. What I would like to see, if the story does get develop, is the relationship development between Haru and Chihaya, while speculating on the final aspect of their fates. I think the story has two ways to go about it, either emphasize on the Magical Girl aspect in the story, e.g. Haruki chants magical spells or perform acts of casting a magic spell, or on the other hand disregard the Magical Girl idea and let the story run in its own pastel colored world, e.g. Haru and Chihaya spends time together at different places, do activities together, etc. Either way, it will still be a magical experience but it up to how the developer would take the story further. (Added) A third option exist where elements of the magical girl theme is retained but introduce additional themes, say they are a pair of prince and knight in shining armor, Romeo and Juliet, etc.
Overall: The game has some substantial story and art that makes it unique and interesting in its own way. The magical girl element may feel a little out of place right now since it feels like it was added for the sake of the game jam theme. As mentioned in the story section and since the game itself has a charm of its own, the game does have a lot of potential in the story side of things and when develop in the right direction could very well appeal to mass audiences.
Note: When writing the description for potential warning of certain aspect of the game in the itch.io description. Please be mindful of spoilers because that literally broke my surprise of any uncertain elements in the game. I would suggest writing the warning as: "Please be advised that the game contains elements that may be disturbing or sensitive to certain audiences" which doesn't spoil the surprised in an obvious way.