Thank You so much, glad You liked my game! The second level is my favourite too, but I might have put too many enemies in there... The game is probably way too hard in general since I had no one to test it. May I ask if You made it to the end?
Hadn't managed to earlier as I had to head out, but have replayed and made it to the end :) the finale was my second favourite, the mothership looks great and the level feels like a perfect mission to end on.
I think the difficulty is great - it was challenging but fair :) an extra level or two early on to help prepare the player for the tricky later stages would be great if you were to continue this