Viability: Your game seems to be in a testing mode at the moment, so I can understand there are a few mechanics missing/not elaborated on. For what you do have now, I am very impressed with. Your mechanics, and plan for mechanics are interesting as of right now. I really love the RPG system you're going with! I will say for the future as you work on this, it may be a better approach to not combine all the systems together. For example, having the NPC's say "meet me at the shop", and then exiting a conversation just to repeat conversations and be sent on a goose-chase may become irritable.
Presentation: I like what you're going for! The placeholders are visually impactful. The font choice is disorienting, though, and needs more work. Some of the backgrounds don't merge well with the font and seem to be causing readability issues.
Theme: The visual theme is a bit skewed. I am not sure what you are trying to go for. Narratively, I'm loving it. Your approach to existentialism, along with the educative value, is wonderful! Keep pushing this- your theme is both enjoyable and interesting.
Engagement: As of right now, things are disorienting due to how the visuals aren't cohesive and the narrative although great is being scattered in directions that seem to conflict with each other. I do, however, see what you are going for and I encourage you to make more fine-tuning and adjustments. This is going to come out great!
Overall, I'm excited for what you can do with this! I encourage you to push this further and work on it even after this class ends. You can really make something amazing out of this.