Wow! It starts with that lit demon face and it catches you till the end!
To be honest it takes sometime a bit too much text to type but I still appreciated the whole story and the ending :) really clever use of the theme and limitation. And well the atmosphere was really stunning, I was that lil robot fighting the portal of chaos.
The big demons with big names were perfectly represented. Not much to say, it's a pretty good entry!
One thing to add maybe, you could've add some challenge by using some memory for the name until they reach a certain distance to you. If you remember the name, you can destroy them directly or wait for them to be closer or something.