Not that bad
When enemy's appear it started to run incredibly slow. I got more ammo then points at a certain moment. If you improve this stuff it could be a good game. It's not a very original game so I don't think it will ever win an award. Anyway it's not bad for your first game, don't feel discouraged by all this. I think you will make some good movies and games in the future. Just keep it up, work a little harder and check out some good movies and games to get some inspiration.
Overall 5/10, good luck with your next project