The new order works. The pack fight now leads, and the cursor is fine if the mouse is a control. Ignore that point.
One thing the switch to GIFs cost you: all six are 426×240. That's a quarter of 1080p, so when someone clicks one, itch opens it at that small size. They're also about 2.9 MB each, so the page loads around 17 MB of GIFs before anyone presses Play. Re-export at 640 or 960 wide and cut each to the 3–4 seconds that matter. Or keep the pack-fight GIF and make the rest full-size stills.
On the cover: a commissioned cover is fine to keep. If you get another pass from the artist, ask for your sprite or tile palette somewhere in it, so the two styles meet.