Games like Pixel Game Maker Series: Tentacled Terrors Tyrannize Terra!

If you finished Pixel Game Maker Series: Tentacled Terrors Tyrannize Terra!, the closest matches are Andro Dunos II, Eschatos, Population: One, Space Invaders: Infinity Gene and Shell Shockers. All 9 share its arcade genre and are ranked by how closely their themes and modes overlap.