Exactly. I'm trying to make a game and I want to set a particular mood from the moment it's installed on device. I'm not planning on actually selling it on the app store with the name written the same way, as I suspect that:
1 - Apple would reject it
2 - Users wouldn't be able to find it through search.
As far as I can tell, Helvetica doesn't seem to have a single lowercase cursive variation on l... I just want a tall right-side up loop (loop on top, tails on bottom.) A lowercase theta looks pretty good but seems to be missing from Helvetica...
I think you're trying too hard.
If potential customers can't find your app through search, any "mood" that might be set is never gonna happen, because
they can't find it.
If your English-speaking customers don't know what to call your app when they tell friends, you're undermining your own potential sales. The likelihood that an average customer will recognize and correctly tell a potential customer to use "lowercase theta" is within epsilon-squared of zero.
I don't know anyone so easily manipulated that their mood is shattered, fractured, or even mildly attenuated simply because the textual name of the app doesn't contain cool math characters. Lowercase omega, capital tau, digamma.