Title Theme: smart contrast of high and low registers to create a creepy vibe! This melody is almost Wagnerian in length, or I'd suggest a repeat with an altered orchestration.
Puzzle Theme: loved the polyrhythm here. Once you layered in all the instruments, I'm glad you changed the harmonies instead of leaving it static on the i chord.
Safe Room: not too much to say about this track-- a nice, simple break from the action.
Battle Theme: while definitely very intense, I think this track could have benefitted from further percussion to really ramp up the intensity of the strings.
Game Over: loved the use of solo strings here, perhaps to imitate the sounds of a funeral dirge. (the Musescore solo strings really do sound good!)
While using clock sounds to tie in the tick-tock theme was smart, I'd have loved to see more creative uses of it instead of just having it on the first beat of each measure, or on the 1 and 3. Perhaps having it in a polyrhythm, or keeping it in 4 over a mixed meter, would've shaken things up? That's my only real criticism: otherwise, you did a great job, and keep writing!