Grind filled, repetitive, boring and tedious is how I would describe this game.
The main problem is that this game is trying to be a plague management game and an "idle" game at the same time, and because of that it ends up doing neither very well.
It's not a very good idle game because the amount of resources you can accumulate will often by limited by various level gates. Once you get enough resources to reach these level up thresholds production stops entirely, and wont resume until the player manually clicks level up. Another huge problem is that although the game has auto buy tools, you don't start with them, which means that you're going to be doing so much manual clicking at first that it's going to make your wrist hurt.
Often you also can't tab out very effectively either, because the production of resources is highest in game when your cursor is directly over the central bacteria. Therefore, unless you have something playing on the other screen, but have your cursor on this game then it wont work out very well. In addition, the game makers added these spiky enemies (anti bacterial drugs I think) that will randomly appear on screen, this cuts your production down by half unless you keep your cursor over them for a bit (or click them to death faster).
So if the idle game is bad, does that mean the management game is workable?
No unfortunately, because the game is expecting the possibility of you leaving and letting your resources accumulate periodically (which doesn't work well for the reasons I outlined above); therefore, the cost of upgrading various body parts is very high, especially in the early game when you often won't have many upgrades (and if its your first play through, won't have any auto buy options either).
This means that if your actively playing, you'll be spending most of the time with your cursor on the main bacteria, click, click, clicking and waiting for enough resources to manually buy more production or upgrades to said production. But the cost of every additional threshold, upgrade, or production unit goes up quickly and dramatically. In the early game you are often buying production units that cost thousands or hundreds of thousands, in the late game the cost will go up and past the quadrillions and into numbers usually reserved for scientific notation.
Another annoying feature is that even when you do start to gain momentum, the game has a "mood system" that makes it so that if you try and upgrade too often, or too fast, it runs the possibility of failure that forces you to start over again. Or will soft lock you into waiting until the "mood improves" before doing more upgrades. The worst thing is, the only way to improve the mood is to level up the immune system and then wait for it to slowly remove the unhappiness, and this doesn't occur when you aren't logged in, so you can't idle it.
(Leveling up the immune system takes away some unhappiness, and the immune system can be leveled up indefinitely, but because of the very sharply rising cost to upgrades in this game, it will become an option you can only use in the early game or mid game, then will become useless in the late game).
This brings me to my next point, repetition. Once you do start to gain some momentum you might start to enjoy certain aspects of this game, the visual assets for the transformation of the host aren't bad (though they are re-used from another game this developer is making); however, as soon as you "win", your transported to a new host and are expected to mostly start completely over again. You get to keep a very small number of your upgrades, and you get a small/incremental upgrade to your overall process, but mostly you'll be doing the same thing over again.
Worse than that, the game expects you to do this 10 to 16 times in a row in order to win, so any novelty or interest you have in the games mechanics is going to get eroded away to nothing as you do the same thing over, and over, and over. And your reward for winning the game? Some half baked cut scene with stock video that basically says love conquers all and everyone should accept each other, etc etc etc.
Then the game gives you some number of specialization points, to start a new campaign with a different "skin" (slightly different transformation visuals) but takes away the vast majority of your upgrades, usually just leaving you with 1-2 auto buy modules. (The worst part is, the skins that you'll want, probably wont be available until you've beaten the game more than once).
So basically you get to start completely and totally over again, almost no retained upgrades, no retained momentum, and the game even still plays all the tutorial text messages and makes you repeat the process like you've just started the game from scratch. Giant "oof".
I wanted to like this game, I like transformation, I don't mind managing numbers/systems, and I quite like the visuals. But grinding for 1-2 hours per host in the early game (more like 30 mins in the late game once you have upgrades/momentum) and then for more like 10 hours per campaign, just to have it all ripped away and be forced to start over again with almost no new game plus incentives is bad game design.
In Summary.
The core loop of this game has far too much grind, the rewards are too few and far in-between, the loop makes you repeat yourself WAY too much with not nearly enough carried over progress, and the fundamental core of the game is seriously flawed because it's trying to do two mutually exclusive things at once (an idle game and an active management game) and settles on having both be executed poorly.
To conclude unless the developer makes a dramatic overhaul to the game, I wouldn't recommend buying it. Even if they do, I absolutely wouldn't buy it for $15, I've seen games with far more content go for a lot less.
Hope this rant was helpful.
