Great game! I really like the concept but i think the game is way too hard, the planet's themselves are almost as big as their gravity radius, and with how fast you're moving it's impossible to enter a gravity radius and not instantly die unless you have lightning fast reaction speed, and moving slower is kinda boring.
I also really like the sound effects you used and the gorgeous art style!
Also, i believe the game you made is a scorerunning game, not necessarily a speedrunning game (as it is seemingly an auto-scroller)