RoGlass

I got way into this tile-placing puzzle game. As other reviewers have said, the achievement sequence teaches you how to play the game, in a way that's more rewarding and momentum-building than a bog-standard tutorial would have been. The icon art and music blend in seamlessly. I found the main game to be just right for me in terms of difficulty. I solved one of the challenge modes, but the others seemed too fiddly, even for me. I suspect it takes a better strategist than I to win all the challenges without either hints or an unlimited time supply. Nonetheless, I enjoyed my time in the world of RoGlass quite a bit. To anyone who likes roguelites, broughlikes, or puzzle games in general, I would recommend that you check out the demo and see if this game hooks you like it did me.
Update: Some days after uninstalling this game, I reinstalled it and played to 100% over the next several days. The challenges were indeed fiddly, but they grew more manageable over time.

There's no timer or other pressure. As you go you unlock new tiles that interact in new ways, or in some cases expand what tiles do. Fun little puzzle game that you can play in short stints.

A fun little puzzle game with nice music.

Easy to pick up but a good ramp up of challenges. The music is calming. Really fun small bite challenges that become very addicting.

Nice, slightly non-linear puzzler, but very short.

This game was great. Couldn't stop playing it until I had won all the modes.