Suggestion Description:

Oftentimes it's slightly difficult to see when the Incense Bonus is full, and thus I suggest changing the dagger's texture the third time to signify, that it doesn't receive any more bonus.

Subject of matter:

It's difficult to know if Incense Bonus is full without looking at the Incense Altar, which can prove troublesome for metagaming - for instance, placing an Incense Altar beneath the Blood Altar

Suggestion of improvement:

Add a third texture for Sacrificial Dagger, triggered when the Incense Altar's max bonus is reached. This can be done by saving the altar's max bonus whenever the player walks by one.

As an alternative, use the third texture when the dagger is charging, switching it to the normal "charged" dagger (or vice versa) when it is not charging, but has some bonus. - this can be done more easily, I assume.

Example of implementation:

https://puu.sh/tKkTl.png

Possible addition:

Separately texturing the dagger for 20%, 120%, 200% and 300% bonus, this would however require a willing artist