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On a second thought, instead of changing the player to fit the level, you can actually do the opposite and make a story about it!

Something like "You have boarded the enemy ship and need to wipe them out/get to the reactor chamber and blow it up/etc." - This way the player is an invader, and it makes sense that they look foreign. 

This allows for several differently themed levels each in different color and with unique enemies. Also, maybe different objectives (kill all enemies, get to the point, protect an npc ally while they are setting up some mechanism, etc.)

But if you go this route, the explanation should probably be in the game itself, not in the description on the game page (add cutscenes with mission debriefs before each level, explaining why the player is there and what they are required to do, or something similar)

It can make the game even more interesting, but it also requires a lot of work (I don't know how much you want to expand this project). 

Of course, I will try to describe, but keep in mind it is just my opinion, you don't have to change anything because of it :) 

First, the shape. The surroundings are all sharp corner walls, but the player is all smooth and roundy, no corners, no sharpness. (I also saw your reply to Speed576 and an example of an enemy - also looking sharpey! I like that design!)

Then the colors. I am not an artist, so again take it with a grain of salt, but the surroundings are black and green and look cold, and the player is very bright and warm. It is understandable that the attention should be on the player character, so they should stand out, but maybe you could find some balance between capturing attention with character's looks and make it more in harmony with surrounding level.

My suggestions to improve this would be to change player's graphics. Maybe make a robot instead of astronaut  (sharp lines and corners) and change color to something colder and more subdued (Maybe violet? Just a suggestion though). 

Or change the level style to fit player character, but I like this option much less (also the music really fits the surrounding. If one of it changes, the other probably shall as well).

Hope this helps! (And again, this is my personal opinion, and I might be objectively wrong here)

Looking forward to seeing how you develop it further!

Nicely done! Simple and charming!

Very cool idea with gravity beams! Cute character and nice surroundings, but missing sounds make the game feel a bit empty. Still, great job!

The theme is implemented well! The music and the floor graphics fit together nicely, but the player looks a bit out of place. Also, adding some animation for moving up/down is something to consider in the future. Maybe also some sound effects when you bump into walls.

Overall it is a nice game, floating around felt almost meditating! Well done!

Simple, but very nice!  Smashing things around is a very nice extra! You managed to add leaderboard, which is great. Keep it up!

It looks very nice and fits the theme well! Took me a while to figure out how to control the ship to get close to one of the big cruisers. Turning and going up/down seems to be more efficient than trying to go left/right, which makes it more interesting! Nicely done!

Looks interesting! I encountered a couple of bugs, like on the levels with two balls one of them frozen and the game had to be restarted, also the graphics on pulling and repelling things would sometimes disappear. Other than that it is a great puzzle game. Great job!

I like your take on the theme!  The game is very coherent, graphics, music, and sound effects fit together nicely! More levels would be great, but for a 3-day jam, it is enough. Great job!

Cute little platformer, took me a while to figure out how to run it, you can probably add instructions for importing it to scratch on the page of the game?

Doesn't seem to implement gravity/zero gravity theme aside from the "normal" amounts of gravity for a platformer. But still, a great job at finishing a game in 3 days!

It is just adorable, music and looks fit so well together! Great work!