This was pretty nice! The artsyle is so round and warm and the writing is fun.
Spoilers below:
I'm sure I got the best ending out of the two, because despite Matt not particularly considering Kou his friend throughout the game he saw a real savior and loyal friend in him at the end. I'm glad they stayed close and even grew up together. The open ending is a great touch because you're left wondering whether Kou is going to turn out to be like his mother, being half-siren...