Hah, seems like we had similar ideas! I love the concept of having to heat or cool planets to the right temperatures, and it seems like it has a lot of potential too. The different planet types I liked especially, since they added a nice bit of variation to the game. Something more to do would've been nice though - collectables, something to dodge, managing different planets at once - since right now the game feels a bit simple. A bit more feedback when heating or cooling the planets would be nice as well, even if it's just changing the colour of them to red or blue. Making the target temperature more clear might've been good as well, but not having any consequences for going the wrong way helped with that - it was nice and forgiving.
The art was good, particularly Big Eddy's sprite - what a character! The way the ship changed colour, and how the sound effects changed, with the different rays added some good variation to the game. The firing sound did get loud when holding it down, though. Maybe it could be a looping sound, instead of multiple ones being played over each other?
Overall, it was a fun little game, and there's a lot you can do with it in future, great work! Oh, and my final score was $424345 - maybe that's cause it didn't reset on multiple playthroughs, though :P