I bought this on Steam, and so I've never played the demo, or any versions other than the complete one (all expansions, too).
That said: This game is awesome... the game, all by itself, no lewdness, is fun, light, and engrossing. The QTEs are fairly merciful (not completely, and not always properly telegraphed) and the combat system is simple. The art... all drawn by one guy-- in itself it's impressive, and beautiful. It all comes together in a fun, sexy, and often hilarious little story that has potential for sequels and a lot of growth. There are built in cheats, for those who want to play how they want, and they're self regulating... you can cheat a little, or a LOT. This, also, is rare, and wonderful, for those that dislike the grind, or just want to 'get to the point'.
Overall, I strongly recommend supporting with a purchase (at least) and maybe some support/love for their Patreon.