ridiculous hit boxes.
ridiculious UI that requires you to move your hand between the keyboard and mouse to play the game. (cardinal sin #1 of flash gaming that smart developers NEVER made)
annoying... text at the start of levels that you can't instantly spam off. you have to wait a fraction of a second before "any key" will clear it. makes pla ying tedious and cumbersome.
i don't care if this was from 6 years ago. flash was already dead even then. the lessons had been learned and you repeated all those old mistakes.