I'm not very familiar with bullet hell, but I can say that with the voiceover at the beginning and the energetic spooky music it has a great atmosphere. Other than that I'll say that it was confusing when during the roll sometimes the controls would invert then uninvert when the roll landed on something other than invert controls. Also I had to restart the webpage once because when I first opened it I wasn't able to move.
Viewing post in Dungeons, Dungeons and more... Dice? jam comments
We thought that the player would assume that each new effect overrided the previous one, so if you got Higher Move Speed while on Inverted Controls it would cancel that previous one, but maybe that could've been explained in a tutorial. As for the WebGL, those builds are known to be very janky this is why I recommended you download for a better experience :)