Ideas

[Omnius]

I just got the game off steam and spent time I should have been sleeping playing it. Great stuff.

I haven't finished the game yet, so there may still be surprises in store. But here are a few ideas:

Fixed blocks
Caves (U-shaped blocks)
Transporters
spinning paddle wheels (impart velocity)
Color mixing (more internal colors which mix when absorbed to make blocks other colors, then you could have it a goal to change your ball to predominantly one color, avoiding other colors)
Sticky balls (which stick to the outside of your ball and prevent you from absorbing or being absorbed from that direction)

[bloodyhenry]

I like some of your ideas ! Sticky balls sounds fun (it also sounds quite weird )