Sorry for missing your email for a year, but i played the game and its really good. the UFO moves a bit fast when going up for a while, would be nice for some more tighter controls. Or at least less sensitivity on movement. Also PLEASE add more music. there is only one song that loops for the entire game, and its kind of maddening. The intro music is the best.
The progression of level design was superb. The adding of new unexpected elements, like the red enemy constantly exploding to clear out the blocks on the last or penultimate level was genius.
Continue to always innovate on previous ideas and throw in something new/crazy.
You already have a good handling on interesting game design. UFO games aren't exactly original, so don't ever be afraid of making something truly new.
ME and my chat love your game. keep up the great work.
This picture is how happy i was to play your game.
im uploading my gameplay soon, if you want to see it.