I liked this game. The art is very cute and the gameplay pretty simple. I feel like there was a lot of thought behind the characters and the story, but because of the time, a lot of it couldn't be fleshed out.
As for issues, I absolutely hated a certain section involving a lot of spears and almost it quit made me quit. I just spammed through it until I got to the end and it felt very lackluster.
Aside from that, if I may state a minor nitpick: I love Undertale, but I felt like the references were a bit too frequent.
For a first game, this is very impressive. I'll follow you to see what else you create in the future. Best of luck!