I really like the mechanic design you came up with - shots needing energy creates a nice trade-off for the player to decide is it more important to power the ship, or to remove a tar monster. Also like the volcano animation a lot!
Two pieces of feedback I have:
1) There is currently a text box in the top left of the screen that seems to serve no purpose, it simply reads 'New text'
2) Collisions were a bit wonky. Tar monsters would kill me well before they actually touched me, and I also found that I could leave the island and walk into 'space', as the island had no collisions to keep the player on it