Thanks for your feedback, yes Unreal Engine is an impressive tool. I've been learning to use it for 3 years.
I have to admit that I had to spend 15 hours a day to do it in one week.
Did you have a problem with the key mapping? I'll look into it, thanks!
I will also check out Beat Invaders, I don't know it.
I'm thinking of continuing the development of this game but less in a hurry. I must have missed a lot of bugs there.
Thanks again, and I'll check out your game as soon as I get home.