Just realized he left a note on the page: I'll post it here.
!!! IMPORTANT INFORMATION !!!
THE HTML VERSION OF THE GAME DOES NOT LET YOU NATURALLY PROGRESS BEYOND LEVEL 2 DUE TO A SCRIPTING BUG FROM EXPORTING TO WEBGL, IF YOU WANT TO EXPERIENCE THE GAME WITHOUT DOWNLOADING, PLEASE DIE ON THE FIRST LEVEL AND MOVE FROM THE "LEVEL SELECT" SCREEN, THANK YOU! TWO IS STILL NOT ACCESSIBLE FOR AN UNKNOWN REASON.