This is a good game and a good concept, but I don't really feel like it's a completed project.
As mentioned in other reviews: no adventurers die, or pass level 20. The art is "good enough" for my personal preference. I'm not expecting a visual masterpiece within an Idle game. I haven't noticed a significant difference of income after buying industries.
There is not much strategy involved, but the story is cool.
I like how the game is scaled to go pretty quick, since I don't personally like sitting at the computer all day waiting for a game to complete. However once 2/3 of the industry tree is purchased, all the shops and adventurers are maxed, the income to cost margin for completing the game is FOREVER!!!! That's my biggest complaint.
I actually liked the song, but the game is considerably longer. Add some others and you'll be set.
Overall I think this game deserves the 3 stars I gave it, but could be worthy of 4.5 stars if you worked out the bugs, balanced a few things and added features at your disgression. Above all I'd like to mention that much of this game's charm lies within it's simplicity. Anyway, thanks for taking time to make this game. I enjoyed playing it. Hope to see a sequel or another version.