Seems like this is the first release of the game and not some improvement, so it doesn’t really belong in the jam, but I’ll let it pass.
This is a cute little one minute game, not bad for your first release! Visuals are decent, though the aliens feel a little out of place (which I guess makes some sense thinking about it). I think the next step would be to try and get creative with the game. Add some stuff that makes your game stand out from others, like unique power ups for example.
The shooting sound effect is nice, it would be cool to have one for hits, too.
Keep it up!