It's definitely unique, but I had a lot of friction with this.
1. The ingame "how to play" is completely off. Perhaps an earlier idea for the game?
2. You've taken a nodelike structure but the upgrade costs are really high with (mostly) very small effects. I was getting about 200-300 gold every 1m 15s, which *might* afford one upgrade. In a normal nodelike sort of game, you're buying 2-3 upgrades a minute.
3. This feels like it was built for an old games console, which is a cool vibe, but it's being played on a PC. I should be able to hover things for more information (are the different circle colours *actually* different?) or see more of the game by fullscreening. I had to zoom in on the web page to 160% just so I could see what's happening.
4. The heroes' movement is very dumb. They're quite happy to start going back on themselves through already-explored rooms even if there's a completely novel path right next to them. Some way of controlling them would help a lot. (I just ended up building a single path every time so they didn't have to make decisions)
Saying that, it's a neat idea and I think it could be a fun game with further development!