Thmyl Lbt Rzdnt Ayfl Ly Ppsspp -

If we take thmyl as they ? t→t (same), h→h (same), m→e? m(13) to e(5) difference -8. y→a? y(25) to a(1) difference -24 or +2? Not consistent.

t (20th letter) ↔ G (7th) h (8) ↔ S (19) m (13) ↔ N (14) y (25) ↔ B (2) l (12) ↔ O (15) thmyl lbt rzdnt ayfl ly ppsspp

Given the context ( ppsspp is clearly PPSSPP emulator), the likely plaintext is something like: where thmyl = they, lbt = have, rzdnt = a problem, ayfl = with, ly = (maybe “the”), ppsspp = PPSSPP. If we take thmyl as they

Maybe it’s a simple ROT13 (shift 13):

t→r, h→g, m→n, y→t, l→k → r g n t k → rgn tk not right. Try one key right: t→y, h→j, m→, (comma?), no. t (20th letter) ↔ G (7th) h (8)