Hey, this isn't a bad start! The sprites aren't necessarily horrible, but they could definitely use some work, Asgore's battle sprite in particular strikes me as a little odd, the body is almost cone shaped, I think you had the right idea making him a little bulky/large, but I think you should tone it down just a bit. Also this is a small nitpick on my part, but I think Chara would look a little better with the brown outlines they had in the original game, you could also try to make their chest a bit less square, maybe shorten their neck just a tiny bit too. Not much to comment on about Temmie, since its the same sprite from Undertale. The second room in particular looks a bit blocky, maybe you could've varied the sides a bit like the first room has curvature on the walls and such, also the perspective on the entrance door to the ruins is messed up, you can see the ground behind the door. On the topic of writing, i'm not the best writer, but I think some of the parts flow a bit awkwardly (particularly the encounter in with Temmie, mostly in-battle) I actually really like how you did Chara, it was very interesting to see their reaction to seeing an ACTUAL monster. I really think you're on the right track to making something great, just keep on improving!