I have ideas.
Teleporters:
Repeatable Teleport
Non-Repeatable Teleport
Coin or key activated Teleport
Multi-Teleport
Terrain:
Water
Stone
Lava
Bars
Spikes
Special Switches
Water Flow
Faces:
Awesome Smiley
Mad Face
Evil Face
Other Emotions
Other:
More Ways to earn energy ( Instead of waiting )
Option to buy 1 gem for 1 kred