Hi,
this demo is really cool. It was fun playing and exploring.
Here is my detailed feedback:
Art/Music/Effects:
The art, music and effects feel very polished and give of the vibe of a polished high-quality game. Especially the "standing/idle" animation helped make the game feel less static and grabbed my attention during playing. The UI feels intuitive and looks good. I loved that the music changed slightly depending on what happened in battle.
Technical Aspects/Programming:
While running in the browser, I had no issues with the game. There was 0 stuttering and everything felt fluid and polished. While it is "just" a 2d pixelart game, it did not seem to demand a noticeable amount of resources, which is always nice.
Game Design/Mechanics:
It is very obviously inspired by Undertale, which is not a bad thing by itself. Undertale was an immensely successful game, so it makes sense that something that has almost the same mechanics might also be popular. In a pre-undertale world, I would say this game is very fun and creative and subverts many expectations. However, when you played undertale it leaves a bit of a bad taste when playing, and one starts to think "this is just a straight undertale copy". After all, "subverting expectations" was one of undertales main charm (in my opinion ofc) and that does not work, when you already expect an undertale-like world.
In my opinion, the game design should include one or two core mechanics that were absolutely not present in undertale, to make it more unique. Of course, ultimately, it is up to the developers and what they want to create. At the moment I would call this "A very well done undertale-copy".