Allot of action h-games really think frustrating game design = fun even when half the point is for the fap material, sadly. Honesty they must have nerfed the speed of the tentacle wall, because it's not much of a problem anymore as long as you're not trying to kill every mob. (The walls in your way are just ones with a HP bar, just attack it enough and it will vanish. Basically treat enemies as more a hazard than anything)
As for the Vampire, he's pretty easy to deal with when you realize the attack that involves flashes of previous game over scenes involves you attacking the hologram of the monster involved in them. If you get all 3 right, the boss goes into a stunned, vulnerable state. Otherwise, the point is mainly to take minimal damage from the bullet hell sequences, though certain attacks give you an opening to land finishing blows early if you think their HP is low enough.
Right now, the game feels almost finished, having around the same amount of porn as your average low-budget HGame and ending with a demon heart that probably is the final boss? There's obviously some missing parts here and there. (No proper h-scene / game over for the vampire mid-boss in level 3, upgrade system lacks the skill menu and, due to the currency system not being implemented, is as simple as just accepting the upgrades)
There's also the alleged extra stage that the hard mode description mentions. My hope is that it's not just a victory lap for the gameplay and it has extra h-scenes tied to it.
Also, side note, a h-scene involving both types of Succubi would be nice. Finding out the game lacks one despite there being an area where one of each type fights but there not being an actual h-scene involving them is really disappointing.
