Heya
When it comes to big boy touhou fangame of recent-ish years, imo it's gotta be Touhou Puppet Dance Performance (and its expansion : Shard of Dreams). In a nutshell, it's basically a pokemon game, but with proper Touhou settings, and it comes with animated touhou girl sprites, an unique artstyle, a possibility for you to start the game with the 2hu of your choice, postgame content, and PvP ! If you're into pokemon games, this will not disappoint you
Dunno about melonbook (can't browse that for this plebeian life of me), but you can try to get it at DLSite :
https://www.dlsite.com/home/work/=/product_id/RJ179146.html (for the OG game)
https://www.dlsite.com/home/work/=/product_id/RJ179149.html (for the expanded, more stacked up game)
And while it's japanese, people worked hard over the years to create a translation and a guide for the game, in case you feel it might overwhelm you (it might be pokemon-like touhou, but types and something you can consider to be more or less "evolution" do not quite match the good old pokemon games) : here's a thread with links towards a translation patch and a guide for this game :
http://thpp.supersanctuary.net/forum/index.php?topic=4364.0(Apologies to the almighty mods if linking to other forums is ill mannered, but credits go to where they're due)
And aside from this game and the ones previously mentionned by Gesh86, another one that was quite popular too back in the days AND is CURRENTLY AVAILABLE ON STEAM would be [Touhou Shoujo Tale of Beautiful Memories], which in a nutshell is basically Supermario RPG. While the artstyle for this game can be generally, uh, spicy, it's not an erotic game nor something you wouldn't wanna get caught dead playing. Various ingame locations and dialogues also respect the series lore too.
EDIT : Sniped by deice. Eh, I'll still leave it here
Find it in Steam here :
https://store.steampowered.com/app/1124060/Touhou_Shoujo_Tale_of_Beautiful_Memories/Another one that, while not so much talked about nowadays, was uncontestably THE Touhou Fangame of 2013 or 2014, and is also AVAILABLE ON STEAM NOWADAYS, would be Tenjou no tempest. An in-a-nutshell description wouldn't exactly do this masterpiece justice, but it's an action-platforming game with a bunch of Touhou weather puzzles, a progression system, a graze-ish kind of system, absolutely EPIC BOSS BATTLES, bunch of challenges, a proper and respectable storyline, and best girl Tenshi Winanawin as the protagonist.
Find it in Steam here :
https://store.steampowered.com/app/994020/Tempest_of_the_Heavens_and_Earth/Another pretty cool one, if you're into MegamanX kind-of games, would be Takkoman : Kouzatsu World
It's a fairly old game, but if you're THAT out of loop, you might probably have not heard about this (a surprising amount of people do not know)
It's got some of the most bizarre, uh, "things" whose chara designs may be inspired by very obscure and mostly arcane memes from a bygone era and a certain community / forum (don't really want to research it right now, sry), but if you're able to get past the ... weirdness, you'll find a pretty fun and fast paced MegamanX style game. Also some of its soundtrack is far too epic than it should be, considering some of this game's content
Unfortunately, it is not on steam, and the Playism store, where it used to be available, closed pretty recently ...
Here's what I found for Melonbooks, although I have no idea how things work there :
https://www.melonbooks.co.jp/detail/detail.php?product_id=32271Another one from Steam is a fangame (duh) by the name of Nitorinc. It's a cool Warioware style fangame (with a voice actress that capture the vibe for the transition comments between minigames), moreover it's also FREE
Find it in Steam here :
https://store.steampowered.com/app/772260/NitorInc_Touhou_Microgames/Also, since it's more or less a kind of a community project, you can follow the circle's twitter :
https://twitter.com/nitorinc (haven't been active for a while, but still)
Another cool one that is also on Steam but still in early access and in the middle of development would be Gensokyo Night Festival. It's a pretty Suika fangame that's got gorgeous spritemanship and pretty visuals
Find it in Steam here :
https://store.steampowered.com/app/1122050/Gensokyo_Night_Festival/Also the dev's twitter, where you can see nice stuff including but not limited to the game development's progress :
https://twitter.com/tea_basira