I've literally forgot to put a warning for the flashing bullets, thanks for the reminder thought. And for the blinking bullets, I'm currently trying to find the issue and fix this as fast as I can. It clearly wasn't my intention to put blinking bullets and I'm sorry I didn't fixed that before releasing the game.
Update: So at the time I'm writing this, I think I've found the problem to the blinking pixels and I'll update it as soon as I'll be able to update it.