What a wonderful little game! I love the game loop and the artwork, though I keep messing up because I'm playing in the browser and am seeing some slowdown. I haven't had the opportunity to try it via Linux yet, but I've been having a lot of fun playing it here!
Also, I know this won't apply to everyone, but thanks for specifying Batou likes milkshakes. As someone who's struggled with drinking in the past I don't always feel comfortable with depictions of alcohol sometimes. But here I feel I can rest easy knowing he's just going to get a huge sugar rush, lol.