Great game, the feel, the look, the music and sfx. Very cleanly done, and it really gave the feel of a retro game.
To not repeat what other's have said, I will say that the volume was really loud though, I really needed some way of adjusting the volume.
Also when the core activated on browser for me, it stalled showing the get out screen for about 4-5 bars of the music before it almost stalled in the browser before continuing. Not entirely sure what it might have been causing it to process so much, but it's just a heads up!
overall, loved it.