A fun, upbeat story considering the situation and the state of both characters. I liked that each ending gave a little more information about the likely fate for these characters (Although for the life of me I couldn't work out how to get the 4th ending). The chalkboard on the main menu tracking the endings was very clever!
The art was great and the characters had good chemistry. I didn't notice any issues with your grammar in the English version.
Great work!