I have some suggestions for new blocks:
- Shadow spikes: Like spikes, but only the Shadow dies when touching it. Player and normal boxes will pass through
- Shadow box: Like box, but only collides with Shadow, shadow blocks and other shadow boxes. The player and normal boxes will pass through
- Fragile shadow block: Like fragile block, but only the Shadow and shadow boxes collide with it
- Trigger block (needs a better name): Like a normal block, but when it receives a trigger signal, it turns into a shadow block (and back again to normal after another signal). When it is in the “shadow” state and it turns into “normal” state while the player is inside, the player dies.