This very well could be intentional, as it's close enough. Just putting this here just in case it wasn't intended.
#Target Word doesn't quite match answer
vast halo
reef belfry
Yeah が can be dropped a lot so this is intentional ^^ Thanks for the report though! 
I could add a note and we've done that a few times, but there's probably something in the design we can do to make this less potentially confusing
It might already be in the plans but will bring it up cuz this comes up every now and then haha
vast halo
It was more the relationship between いい and 良い. I didn’t know this until I looked it up after seeing the card, but there is no て-form for いい, so the target word section makes sense - it’s the irregular/spoken version of 良い. But the usage in the sentence is in the て-form, so it has to be written as 良くて.
I understand now, and the card is probably fine as it is.
reef belfry
Ah yeah I could see that being a confusion point ^^ Might be worth adding a note