I would give it 2,5 out of 5.
Tunnel Escape is a rather short looter-shooter-Resident-Evil themed game.
It's a wonder capcom didn't ban it for copyrights stealing.
Gameplay? Tedious.
Especially the 20 rooms for every exploration and hordes of enemies at every turn.
It is really not something you would want to see.
And the further you go, the more apparent it becomes, that they didn't test this game. At all.
(Or did it, but with severe cheats)
At level 1 you have 1000 health and 100 mana.
At level 50 you have 1500 health and 130 mana.
For every boss and exploration I was using my whole inventory of items (Ammo, grenades, consumables), and was only able to come out on top due to my wits and luck, in equal proportions.
What's the issue you ask?
I was playing on Easy.
On Hard I was suffering through the 2nd floor by the time I completed the game on Easy.
And due to the local system of skills (random loot from any encounter, in random order), I would have had absolutely no chance at completing levels from 3 to 6.
At all.
Compare to easy, you will get double damage to your heals, and deal 10% less damage.
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But why would someone want to rant so much about battle system in a porn game, you may ask?
It all should have been circumvented with the Adrenaline (Arousal mechanic), where you receive bonus damage the higher your arousal is.
The problem is, it can only be increase in decent quantities through sex, and sex increases your Infection point, which is a shorter way to game over.
And sex in this game come only in the form of various zombies (fatmen, dogs, plants, deformed masses, robotic drones and living armor, etc.), which all, without fail, look rather disgusting.
But that is not the only issue.
This arousal bar drops far too fast, and the Stimulant, that should have increased it, doesn't keep up with the decrease rate.
You want some more?
Listen here, then:
Increasing the Arousal lowers your chances of breaking free from the Zombies' advances.
And having sex with them gives your various double-edged buffs. That can be stacked unlimited amount of times.
Essentially, if a 1st level dog fucks you 20 times, your Maximus health point would drop to 0 and you won't be even able to tank the initial sex advances, which also inflict damage.
The only way to shake off those "buffs" is to craft a potion, the recipe for which will be available in the store for 10k gold, after you beat the 3rd boss.
On average, you earn 0 gold per completed run.
.........
Yes. Everything you will earn will have to be spent on ammo and consumables, so that you won't instantly die on the next run.
Do I need to say, that this system sucks? I hope, no.
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Why would you give it any stars then?
Simple. the main heroine looks sexy.
Sound effects are not horrible.
Sex scenes, although simple, can still brighten a very lonely evening.
And the turn based system is the best I've seen in RPGM games.
(Sadly, only the hand-gun can interrupt the enemies, with it's normal attacks, and there are no sure ways to increase your agility to designed levels)
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To sum this wall of text up, do not waste your time.
But it could have been much better, if the game wasn't tested with cheats.