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I present to your attention a classic platformer shooter roguelike without frills. In it you will fight a lot of enemies using different types of weapons and ammunition. One of the features of the game is the ability to combine bullets and weapons of your choice. Take a machine gun and vampire bullets and become almost invulnerable, or a shotgun with slowing bullets and no one will catch up with you. I am sure you will make your own assembly that will suit you.
Loot chests and a portal that requires the souls of monsters are randomly scattered across the levels. Fill it up and go to the next round.