I agree with most of the feedback other people gave: 
some soundtrack + some game progression would be nice.

Other than that, I enjoyed playing your game. The sound effects were a nice addition!

(I hope you make it to 20 ratings :] )

Really fun game. Power-ups would have been nice but considering the time frame, it was well executed. Good job!

Nice game

I would like to see more progression acrosss the game, maybe change the bullets or something else to make it harder

the movement of the ufo was pretty smooth.

Nice concept. Cool sounds and graphics. 

Interesting game. I like how arcady it feels. Good job. :)

Nice simple game! I like the graphics and idea. Good job!

This being your first game, really well done!

Great job, actually!

As for feedback, I think a soundtrack would've made a huge difference if possible.

You could improve on this game a lot more after the game jam, but over all, nice job.

I liked the game.

I like it!

Despite being a simple game I thought it was super fun. If you choose to  continue work on this I would love some increasing difficulty (maybe other kinds of bad guys with different kinds of weapons) and objects with variable points (people = 10 points, cows = 20 points, the mayor = 50 points, etc) .  The audio was great, the art was super cute, but above all, the gameplay was really fun and intuitive. I think there's a lot of potential here if you choose to expand on it!

The pixel art is very cute, love it!

I just rated your game, maybe you can do the same on mine ^_^ 

well done on this submission. I've been running through games with low rating numbers to try and get them boosted to 20 and yours stood out :D So first thoughts: I would love if you made the resolution a bit better or an option for full screen. Currently looks like it would suit mobile very well. Secondly it was quite easy and the shots were never too hard to deal with. This said I loved the concept of you being an alien craft having to abduct humans! Not sure I've seen that anywhere else so really nice idea there. I thought the graphics were pretty cute and loved seeing what all the tiny humans were doing. Good job! Make it a bit more difficult and provide a bigger resolution and this could be the base for a really good game!

Really nice game for your first jam. Good job.

The graphics and gameplay are really cool. I think making a difficulty curve (making it harder the more points you have) would make it much more fun, but well made!

Really good implementation--the controls are good and the difficulty curve works really well. I like the challenge of trying to nab the gun guys without getting shot. Not really much to do with the theme, though.

This game is polished and fun to play! Great job!

Nice work!  The atmospherics of the night scene and lighting is nice, and I especially liked the physics of the abduction, how it sweeps people up in a gradual, swirling way.  I agree on suggestions for further development mentioned by others -- making it gradually harder, introducing new challenges, larger area, etc. -- but we had a week!  Good job.

Cool game. Gets a bit repetitive in a bit, but the art is nice, maybe a timer or a bigger map and multiple types of things you can abduct for different scores, and a difficulty curve and it would be more interesting as well.

But very cool. Good work!