I'm glad you liked it!
Yeah, I kinda just.. didn't wanna add Qix... but I hope Octoroks were a fair replacement! I tried a lot to make sure space invaders felt accurate but wasn't more than the original games, so it can just shoot through walls. I was initially considering allowing you to shoot through terrain but I kinda forgot, oops.
I'm also glad you enjoyed the unique sprites for each enemy! It was something I thought would really elevate the game feel so I'm glad you appreciate it.