Thanks again for playing it! Yes I'm going for as little UI in-game as possible - hopefully the inventory bar will be the only interface.
Interesting, you're not the first person to mention about the "spikes" - as they are technically foreground elements I wanted to keep them the same colour as the level geometry. I'm wondering if I can have a short "automatic" sequence at the start of the demo where the player walks passed one of them to show they are harmless. I'll have a little think about that though.