It is extremely important with text adventure games that test with real players to make sure you are providing players with responses they expect from the game. 

For example, if you casually mention there is a trampoline in the room and the player types:

> JUMP TRAMPOLINE

And the game responds:

"I can't do that."

The player is likely to have a negative view of your game. Playtesting will find the majority of issues, at least early in your game, and you can take the wisdom from there and apply it to the rest of your game.

You should, as a general guide, allow several days for playtesting, playtesting should be performed before the jam deadline, so it's important you aim to complete your main development a week early, and go from there (even 24 hours of playtesting is better than nothing)

There are two suggestions here:

(1) Make the first part of the game a tutorial (for players unfamiliar with text adventure games).

(2) Ask a trusted friend to playtest.

You can use people you know as playtesters, or request a playtester here. Participants may also offer playtesting services for other playtesters.