Not so much insane, but there's a small bug in the spawn code handling the enemies that bugs me for not noticing until later.
Long and short of it, I used a few random numbers to specify how many spawn, where, and what type. It was supposed to spawn two types equally, but a small oversight changed equal 4/9 chance into 4/10 and 5/10. Literally one digit, off by one, and the larger, enemies are spawning way more than they should.
I also got the lower bound of spawning one type of enemy wrong, so it likes to bounce into the floor on occasion ^^;
A lot of people say my game is difficult, and I wonder if this is part of the why.