Xerion is an excellent looking tile-sliding puzzle game. Unfortunately I haven't sunk much time into it, because I've had trouble figuring out the "balancing" of the tiles to solve the puzzles. Aside from this, it's an all-around great puzzle game.
I love a good puzzle game, and this felt like something I could see myself buying. I did have trouble progressing after the first few levels. I think that I stumbled few the first ones, and then didn't fully understand the core balancing mechanic behind the game once I reached more advanced puzzles. I find the riddle intriguing, but shedding a little more light on the "balancing" could be advantageous without ruining the intrigue of the game.
I think that the interpretation of the theme is solid, as tile-sliding or match-3 games are common games that feature some sort of combo. Nothing feels revolutionary in that regard, but that's okay because it's really well executed.
The graphics and audio are what take this game to the next level. The pixel art looks great and the colors tie together nicely. The background audio and the dialogue after completing a level are very fitting for the atmosphere. These elements really tie the game together and create a super strong, enticing mood.
Relating to my earlier comment about having difficulty with the balancing, some additional visual effects and sound when some elements are aligned properly could be a helpful indicator.
Humor isn't really applicable for this, but the game has character!
Great job on Xerion. It looks great, and I'm impressed that it was made in 48 hours, as it feels like a complete experience!