If you liked this
Games like R-Type Final 2: B-99 Apocalypse R-Craft
If you finished R-Type Final 2: B-99 Apocalypse R-Craft, the closest matches are Hyper Scape, StarRunner, Yet Another Krappy Shooter, Counter-Strike Online 2 and Metal Slug. All 10 share its shooter genre and are ranked by how closely their themes and modes overlap.
