Making a short game in a month is a big ask even without custom art, so yeah, I hope you feel proud of that! The art didn't suck, it just wasn't my taste. You can't please everyone, but I still appreciate the amount of work that's gone into it. :)
The game is still easy to understand, (and actually your English is a lot better than some of the games I've played by native speakers. xD) Unfortunately I can't really go through the errors since they were spread across the entire game, and I don't currently have time to replay it. There are places where you can go to get help though. One of those is the rpg maker web forums! You can make a post here asking for some help. I don't personally own Rpg Maker VX Ace, but there might be someone on there who you can send your whole project to, or if you prefer, use the deployed game and have them write it all out for you.
You do need to make sure you read the rules of the sub-forum (the very first thread), which state that you have to have at least one post before being allowed to ask for help, which is a perfect chance to introduce yourself! The people over there are really nice, so if you felt like it you can get involved in other parts of the community too! You might be interested in the secret santa we have going on, you're given a random IGMC entry to play, and in exchange, someone else will review yours. ^^