This is quite an adorable comic and I enjoyed reading it. The lines and shapes are well done and I don't see any fault. The facial expressions are adorable and for the most part fit well. The background is fine and doesn't detract from the comic.
In the first panel it looks a little weird because it doesn't really look like they are looking at each other. Berry seems to be staring at something to the right of me while Thunderlane seems to be avoiding eye contact.
The font is a little hard to read because it gets so close together with the black outline. Thunderlane's words especially can be hard to read.
The only other thing, and it might just be because I have a mild color deficiency, is that Berry's tongue looks to be the same color as her coat. She looks really weird in the third panel because of this.