Succubus Survivor is a solid H version of Vampire Survivors. There are five stages, (4 normal stages and a boss stage). In the "Story" mode, each stage spawns a boss at 10 minutes, in survival mode, levels 1-4 can be played for up to 20 minutes each. Stage 5 is a dedicated boss stage, where you start with some weapons already leveled up and need to avoid attacks from a boss.
Overall, the gameplay is very similar to its namesake, but this game's balance is much looser and the player is typically more "OP" than in VS. A lot of this comes down to how VS doesn't include specific synergies, but in this game, just about everything scales with everything else. So for example, your DOT attacks scale with "attack speed" to trigger more frequently, which is specifically avoided in VS. As a result, it's very easy to get super strong in this game, and Stage 4 (with a relatively bad build) was the only time I faced a challenge (but didn't lose).
Much like in VS, if you want to get overpowered you need to focus on picking up tons of drops, and mixing together the right skills. The flask and the AoE skill are both super powerful in particular. Ideally, you would start with the pink haired girl (for her AoE skill) and someone else. The other thing you'll need to do is to pick up the magnet upgrade as soon as possible. Having this item makes you level up much faster and stay ahead of the difficulty curve. The other key item to mix with the flask + AoE skill is the screw, which adds a flat damage bonus to every attack. The flask hits very low (3-5) but triggers many times per second. Mixing the screw with the flask allows you to melt most enemies, even bosses, with flask drops.
That is to say: Magnet + AoE => Flask + Screw = Win
The other main difference in this game is that you control two characters at once unlike in VS. This is fun in theory, as you can work on two different builds at once (each characters weapons/accessories only effect them), but in practice stacking everything on the character you directly control is the more reliable strategy. This game also features enemies who shoot projectiles (unlike VS). These projectiles are mostly very weak, but dodging them amongst all the onscreen noise (especially with your second character) is annoying.
Lastly, let's talk about the H.... it's a little disappointing in my opinion, (although to be fair the bodytype of the heroines isn't my favorite). Even though the game is relatively easy, you won't have time to watch the H scenes due to the speed of normal gameplay. There is a competently made gallery, but it lacks the progression shown during gameplay. Even though this game can be played one handed, I didn't find it fappable.
Overall, this is a much better gameplay experience than most H games (it's fun!) but the H is lacking. Also, there is a story, but the rough + slow machine translation had me skipping it
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