I enjoyed this and played for quite a bit. I like the concept of being able to upgrade the worm, especially reducing the drain rate of the energy. I found out after a few rounds that the drain rate was all I really needed to upgrade, and I was happy I could continue upgrading beyond what the UI displayed. A high-score system would complement this game because then you'd have a reason to upgrade your worm and continue playing. It feels like a rogue-lite in a way. I wish we could upgrade the turn rate as well! Overall, really good entry and a nice concept for a casual game.