I played it a few hours ago, I liked it. The music and art style fit with each other well, and yes, it feels like a complete game. Personally, what I would consider changing a bit though is the very end part with the Golden door. I finally got to the part and looked at it knowing I was going to have to start from the very beginning. If there was something hinting at which squares were right, I completely missed it!
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Thank you for your comment!! Regarding the golden door, you're right. Maybe I should add a final cutscene to indicate that you've successfully escaped. As for the squares, they are designed so that you don’t immediately know which one is correct, requiring trial and error to figure them out. However, in the room after passing the green door, there's a sign telling you to look back. When you do, you'll find another sign with numbers indicating which platforms are correct.