Don't listen to this other guy. I actually put some real time into this game and was pleasantly surprised. First, yeah, I did encounter one potential softlock wherein you slide down a hill in the last-ish area. All softlocks can be solved by "checking" until you run out of energy where you just teleport to the start of the area. (Like 30 seconds away). I didn't encounter any other bugs and hope he gives this game another shot.
In gameplay, it's a mix of very light puzzles and general awareness. To find the monsters that you need to stick your meat scepter into, you need to look out for clues. Could be a rustling cattail, a circle of stones or a splash in a body of water etc... "Checking" these will reward you with XP for whatever monster girl was hiding there.
In content, if find enough of the same girl, you get a CG, Animation or sometimes even a comic. It's a mixed bag and there's usually three for each monster girl. All very well done and repeatable. Some girls have less, however. It kind of reminds me of pokemon, if you played as like, a professor, just researching them, instead of battling and catching pokemon.
Speaking of research, for each new CG you unlock, you get a paragraph+ of info about a monster, which I found to be short enough not to bore me and interesting enough to be almost as rewarding as the CG itself.
Conclusion: Give this game a try!