I'm super sorry to hear that glitchy levels ended your runs several times. I'm chasing a few bugs (like that one), but it's a bit hard to verify when a solution actually worked. I'll keep working on this and upload a new version when ready!
I'll take a look into the other bug (when you got out of the map). If you can recall anything about that scenario, it'd help a lot.
Regarding potions, they all take effect after tapping on them. You get a hint about each potion when you pick them up and you can reset hints on the menu.
I also made an Android build, but it's a bit rougher than the PC one.