Definitely eye catching effects on the visuals. Music's pretty moody too.
I wasn't sure what the objective of the game was. Even when I uh.. "emptied" the attackers into the chalices the contents just disappeared a few seconds after being filled.
There's nothing more to do other than filling the blood bassins and launching people onto spikes. Those sacrifices fuel the opening of the portal. There's a delay between each possible sacrifices at the blood bassins, that's why the content disappear after a few seconds.