It's... so smooth you don't believe it is online, right?
You can try with 2 computers / comp+phone
it is an actual IO game with added effort to hide internet lags (i used extrapolation and interpolation plus client side box2d to predict server state, and have the server dictate the true game state)
i have successfully coded all that server code during the jam. the client side comes from an old project though.
Well, that left me with no time with the game logic so it is what it is.
Thanks for trying and rating tho