As an RPG Maker game, I kinda expected a quick and fairly forgettable experience, but it was an excellent game. Even though the assets are just standard RPG Maker ones, the locations, details, and gameplay pacing were top-notch (the latter is particularly remarkable since you say this is your first game). The overall plot and fantasy setting are fairly standard, but good nonetheless. The open-world nature is awesome and quite refreshing as opposed to heavily railroading the player.
Initially I expected only 1 or 2 companions would join you, so I was surprised with how many you pick up. In hindsight, the companions added a lot of soul to the game. The fact that the companion side-quests are great, entirely optional, and even useful is just awesome. There's a lot of untapped potential still and I would enjoy being able to further engage with the companions and their own goals.
The humour is top-notch, quite amusing but doesn't get excessively ridiculous. I lol'ed amused throughout the entire scene with the casino owner and security guard, it was just brilliant. The little dialogues you get by talking to random people are great, it's as if they truly exist and have a life of their own in the world.
There's quite a lot of typos, specially towards the end of the game. Given that the writing itself is often pretty great, it can get a bit jarring. The sex scenes were decent enough, perhaps overall not as engaging to me due to some particular setups (non-consensual stuff, two instances of smelly old men, etc).
I only found one serious bug: in Deladona's quest, if you give the medallion to the thug in the Outlaw Canyon, leave and then come back again (for example to get better gear), he will be permanently blocking the exit and you won't be able to complete the quest (a workaround is to edit the character position in the save file).
I was thoroughly impressed with the quality of the game - I hope this encourages you to further develop games.