Hey thanks for your reply! The main issue with the sword attack is actually the way the WebGL player calculates time - it's a bit slower than the editor and OS builds. Getting this right in jam time would have meant repeatedly building the WebGL version of the game (which in itself is slow) while tweaking values until it felt "right". Definitely something we'll look into in the final version though once we've got the time to do this. Until then, I'd recommend taking the cartridge out, blowing away any dust and then reinserting it into the gameboy before trying again.