Ok, I am going to say that it is weird that in *Second chapter Spirit drains when no action is being performed (basically asking the player to always be ready to press Pause to actually think about what to do next) and especially so while doing stuff that states that it will consume Spirit
(+1 DS for 5 Spirit sound great until you realise that it really is 5+14 Spirit even with all Ooze time upgrades...)
Also a bug - "Carapace dagger" gets damage bonus from "Rupture" but not "Dagger Master" for some reason (and is slower than "Magic Dagger" even after being described as 'unnervingly light')