A cute and chill game. The music and sound choice make it a very pleasant experience.
I usually don't go for backgrounds with this much contrast, but I think it works here since the characters and backgrounds do not intersect. The characters look nice too.
Maybe it's because I'm using night light (orange screen) right now, but it was a bit hard to differentiate between the tool type from its effect. Still, there's a button below the tool VFX that makes up for it, but it would be easier if I could see my weapon choice closer to the center of the screen. On that note it was also hard for me to distinguish between the robots and the humans, but again, might be the night light mode doing its job.
Maybe I'm biased because I like tough games, but I think you could ramp up the difficulty a bit. There are not many humans and robots so it's very easy to click on all of them, and there's a lot of wait time when the trains switch up.
Good job overall :)