A chair is a kind of supporter. A chair is always enterable. A chair is usually scenery. A chair is usually lens-searchable.
Understand "seat" as a chair.
Does the player mean entering a chair: it is very likely.
Instead of going up when the player is on a chair (called the seat):
try getting off the seat.
Before going when the player is on a chair (called the seat) and the noun is not up:
clarify "first getting off [the seat]";
silently try getting off the seat.