My Vita isn't usually unstable, thinking about it i may have launched the new run too quickly, or it could've been my end, i really don't know, as you're games usually are pretty stable. if i figure out why it did that, i will edit this comment to let you know how to trigger it, and possibly fix it.
Alright, found out if the game is running for a few runs, it took around 3 runs to around level 5 - 8, the game oddly just freezes, music plays. though no keybinds work, fps counter still works, and i cannot exit the game. and am made to restart the system, doing some more tests, though this is the only homebrew on my device that does this, not even purified does this. unfortunately that is all i know, as that is the only way i've been able to trigger it.