I'm too scared to play this game again after watching @caveware play it on our stream, but you should know that you made him scream with terror. That alone is a solid five stars for scares. As far as feedback - I think modifying it further would sacrifice the simplicity of the concept and the scares. Maybe a small UI for players to better gauge their progress - but then again, the contextless play and the wide open void of the vent is eerie in itself. Maybe more creepy crawlies?
Thanks for submitting this game to SCREAM EMPIRE!
- SCREAM CATALOGUE