ヘルテイカー(Helltaker) is a Polish indie puzzle game by vanripper about a man who wants to build a harem of demon girls, so he goes down to Hell to get them.

This was recommended to me by the Poles…and, well, I don’t regret playing it.
The puzzles in this game start out pretty simple, but quickly get more difficult, to the point that I was stumped many times. Since my focus was on the story (that is, cute demon girls) I did look at a walkthrough, though I don’t think I’ll look at it the next time I play…which’ll be in a few years, so I forget all the solutions.
Helltaker is fully free-to-play. In fact, you have the option of paying for the artbook…but that same artbook can be unlocked by completing the game. It’s odd in a good way.
The art and music in this game is just excellent. Plenty of personality in the art…but, the music really won me over: some of the tracks, like Apropos, really give me the feeling that this is Hell and not just a goofy game. It all fits together really nicely.
The story is extremely simple: you are the Helltaker, whose goal is to build a harem of demon girls. Hilariously, this plan actually fails in the end, since he ends up in Beelzebub’s mansion in the void. The balls and determination on that man. Yeah, there’s nothing more to it.
It’s just a good game. If you want to see more of those demon girls, the creator made a few short comics that you can read.

• Steam
• Fandom Wiki - I haven’t looked at it deeply.
• Soundtrack on Bandcamp
• vanripper's YouTube Channel
• Vanripper's Twitter