Completed the game with Mosquito on Easiest difficulty (MiSTer).
This game is ridiculously hard even on the easiest difficulty. It feels like your weapons are weak, and you have to hit hundreds of times before you kill an enemy. It's not very satisfying.
Screenshots marked with 🍒 are created by syltefar and are considered public domain, free to use for anything. If you want to, you can note where you found it and link to this page.