I appreciate that Tikal's been ported, however there's quite a bit of changes that this add-on could use to make it a bit more unique.
1. Considering Custom Colors are a thing now and you did it with your Amy, too, Tikal's skirt could also be colorable for a bit more of costumization.
2. Tikal could have SF_MULTIABILITY so she could glide even after finishing gliding, just like she did in Adventure 2 Battle.
3. Tikal shouldn't really crouch like Knuckles does, since she didn't do that in Adventure 2 Battle, maybe have Tikal do the same no-crouch move if she lands while gliding, like Legacy Rouge does?
4. Possibly Tikal could use some SRB2 Battle moves in the future inspired by her SA2B multiplayer moves which she could do at the cost of rings.
Some of those could be implemented into her core gameplay though, just an idea.
5. Tikal could have Knuckles' own spindash sprite for a bit more of detail.
6. Tikal's sign could be her character selection art, for more detail.
Overall, it's good, but try to keep working on it.