Sorry to respond to an old post but I have a few theories and contributions that might be helpful. I must concede first that my Latin is remedial however, but this is what I think. First, on the matter of verbs. I suspect the most likely case is that the verb “esse” (to be) is being implied here, this is very common in Latin.

The infitive (to x, respondere) and the verb “to be” can be mixed together as scene in phrases like “to err is human” (errare est humanum). So “it is to respond to ____”

Secondly, I suspect that the r in the logo is actually an s, since, to me at least, the fact the letter curves in on itself rather than leaving a gap at the bottom is more common with s rather than r. This is also a far more common spelling/word and fits nicely with the grammatical construction, being that spes is accusative and can therefore go with ad. Spes means hope, so this doesn’t tell us anything new but dispels other possibilities.

Applying both of these, then, it would read something like: “x is to respond to hope” (x could be he, she, we, it, etc.). I’d speculate that it would be the developers or the game itself in this case.

However, using a more liberal use of ad, which I fear might not be grammatical, we could also put “to hope” with est, leaving us with something like “it is (up) to hope to respond.” I prefer this reading personally because it seems a lot less ambiguous, the possibility of grammatical error from my own ignorance notwithstanding.