I can very much see the Earthbound/Undertale inspirations here, from the battle backgrounds to the sprites and UI, to the general weird/unsettling feel of the game at times, especially with the excellent sfx and music. Honestly, I had a lot of fun with it, even with how short it was!
One thing I will say is that the combat system, while super interesting, can be a little bit frustrating as well. I did find out you could just spam through encounters with mouse and keys, but I didn't use that since I wanted to experience the game as intended.
The frustrating part for me really comes down to the fact that, if you get the first element wrong in the sequence of the attack, you still need to go through the effort of doing the remaining elements (right or wrong), then attacking just so you can miss. I think if the attack cancelled immediately upon getting something wrong, it would be a lot smoother.
It also wasn't clear at some points what could and could not be interacted with. I got stuck for a while since I didn't realize I could interact with the key block.
Overall, amazing idea for a game, which could use a little polish to truly take it to the top. Loved the ending. Found it very charming.