Tried pressing all four keys to start but could not start it.
:( that's sad. Is that coming from the webgl build? What's your computer make and model?
I tried both. Its probably more likely a keyboard issue and something called "Anti-Ghosting" https://drakeirving.github.io/MultiKeyDisplay/ using that tool I can press several keys at once but a,s,k,l wont light up together.