Thanks for the reply.
Left mouse ONLY!!!
Viewing post in Night On The Street jam comments
I tried it but it uses mouse movement, which equals to 4 more buttons at least (up, down, left and right), as written in the jam description :p
Still a gorgeous game, congrats! But not a 1-button one ;) Try the other submissions to see what we mean. For this year or 2018:
https://itch.io/jam/1-button-jam/entries