Nice idea of a game and I did see you tried! I never used visual scripting before but I guess that's not remotely easy to use. Anyway, the game is decent enough, there is a gameplay loop going on but I would hope the game increases in difficulty the further you play so that it doesn't get boring after playing for a while. Being able to shoot down the UFOs is definitely an interesting idea, and adding in some effect that indicates one being destroyed would be a welcoming addition. For me I never realised that one is destroyed until someone pointed out that the number in the UI is different.
Anyway, keep making games and have fun!