Like the concept - having to fight enemies, staying laser locked on the Sun at the same time, is something potentially challenging, even though certainly requiring some balance.
Would be nice to see more feedback from enemies and the Sun like hissing and steam particles as you pour the water. This would make the gameplay much more satisfying. (Or maybe it's present in Desktop version, because I player Sunfighters in browser)
My biggest problem with this game is the music. Tbh, it really goes hard on my ears, and the fact that it's poorly looped doesn't help at all. Would be great to have sound settings in-game, rather than just in main menu.
Good luck with your next projects!