It seems like you put a lot of effort into it, but I'm having trouble getting past the title screen. Tried Safari and Firefox. Pressed every button and mouse click I could think of.
I wasn't able to play it in browser either. Tried chrome and firefox. The button seems hidden. But I recall having this problem on another game and it really looks like it's a scaling issue.
Maybe allowing player to fullscreen your game in itch.io could fix the issue ?
