great concept, but unbalanced
You are definitely onto something here. I really enjoyed the game, but I did find it pretty unbalanced. I have several suggestions and I think you could make a dynamite sequel.
1. Increase the size of the planet, giving more room to maneuver and explore
2. Have the mini worm powerups spawn every few seconds or so, instead of all at the beginning. Kindof a waste to get healies when you are already full from the start.
3. Have more types of powerups
4. Have a more configurable worm (length, appendages perhaps)
5. Seriously consider lowering the power of the enemies around level 5, they are simply too strong, considering there is no way to damage them without getting damaged.
I think you have the makings of an excellent game with a totally new concept. Any new idea is going to need tweaking. Keep up the good work and I look forward to seeing a playable sequel or some updates on this one that fix these issues.