Please provide difficulty options. The game looked interesting, but there's just too much going on for me on the screen at one time. Just being able to slow down the game a little would help a lot. Based on the demo, this isn't something I'd enjoy at the current difficulty.
The difficulty for the first level is now more what I'd expect. However, a speed (difficulty) slider would still be appreciated especially due to later levels. If that's unrealistic, then just consider an unlimited lives option. Alternatively, maybe a rogue-lite mechanic of some kind would work here. Right now it's too easy to get increasingly frustrated in a cycle of spawn-die 1 sec later-spawn-die-spawn-die-spawn-die.