Before reading this review please be aware this is to help you make this game unique and your not to destroy your hopes in it.

If I could select needs most work I would have selected everything except the graphics and sounds. The settings for changing the sounds are overly complex though for all the user really wants to change is master, sound effects and music not bgs, bgm etc these terms are too specific to people who just play games for fun. the story line dialogue etc are all way to similar to undertale to the point that it seems like you kept the undertale dialogue and changed the names to your characters also you keep using i instead of I in the games which was rather odd.
When you enter the game you are not given any background or story at all as in who is this guy I am when did I push him into a lake? how is pushing someone into a deep hole the same as pushing someone into a lake. if it was just a "prank" why did my "friend" not help me out? just leaves a lot of questions.
Easter eggs way to easy pretty sure I found most of them on the first run when trying to figure out the game. You shouldn't mention people who haven't met yet when saving by clicking on the crystals. If you are going to use high graphics in your game for the art at least have the character customizable undertale wasn't customizable due to how simplistic it was and how it was suppose to be a reference to the previous human who fell down. I did not get that vibe in this game. Also undertale you can choose not to fight I was not given that option when I got into my first fight my escape option was locked and I was only left with attack.
If you are making a game to make something unique then don't copy a similar game to the extent that you just slapped different graphics on it and said it was different I would suggest having the story line be different at the very least if not changing the lay out of the game for you start in the dungeon almost the same way all black with a small patch of grass. I also HEAVILY suggest changing the character movement it felt horrible due to it being moving from one tile into the next. What you have taken from undertale is the story of the game and took what actually made it entertaining out. For in undertale you moved not by tile to tile but by step to step also what really made undertale stand out and be unique is the fact that it was a fighting game that was more entertaining by not fighting. So if you really want to make a game inspired by undertale dont rip undertale off but make another fighting game that is better with out fighting which to be honest is the hardest part about making a good game.

This is not meant to make you feel like your game is bad for it is actually a good starting point however you need to stop working on the polish of you game and more on the mechanics and the inputs the player feels when moving and doing stuff in the game. I hope this helps and I can't wait to see your future updates.

I had a much longer roast here before but it didn’t post and got rid of it.... so in short of what I said before on the phone IOS the game takes a while to load the password and email is hard to read the background looks great however after loading into the game all I see id the health bar and some super shrunken down ui in the bottom right and I have to scroll to see one or the other. Also my screen is black other then those things...