Hey there,
I've been trying to remember a game that I played when I was a kid I want to say early 2000s maybe a bit earlier.
It was a game similar to the Worms franchise but in space. You controlled a little ship that could move or shoot various weapons. you were beholden to the gravity wells that big planets created and would take turns shooting different weapons across the map to try to blast opponents. I don't remember much about it, I may have only had the demo but some of the weapons included firestorm which would blast part of the surface of the planets, there were MIRV weapons and clusterbombs lots of different nukes and stuff.

I've been trying to remember for the life of me off and on for years and I can't seem to find it.

I've also been trying to find an early PS1 game where you play as little characters inside a rotating cube but can't remember that one either.

Any help would be super great!

"rotating cubes" make me think of Intelligent Qube and Devil Dice, but you aren't actually inside a cube just standing on/running from them.

ITS WARHEADS! Thank you!!!! It's been one of those things I've been thinking about off and on for years!

For the second game, depending on the genre, I'm thinking it might be either Blast Chamber or Tall Infinity.

Warheads SE used to be free. I don't know if it still is. Colors can be distorted when you try to play it fullscreen, though.