(I've been thinking about doing threads every few days - probably not daily - dedicated to and highlighting a specific quality, well-received game that GOG rejected. If enough people with well thought out criticism don't want me to do this, that's fine; however if it's just bitter and angry people annoyed about this I'll be less inclined to stop this. And of course you can make your own threads, not like I have a monopoly on this idea. :P I'll be going through the "turned down" thread for ideas to start with, but I'm open to suggestions in the comments.)

Starward Rogue

Starward Rogue is a bullet hell twin-stick shooter. Blast your way through the Megalith, a rogue-lite labyrinth lodged in the side of a star. Customize your mech with a huge variety of weapons, perks, and upgrades. Steel yourself for the dangers that lurk in the depths of the dungeon.

Fully playable with keyboard+mouse or gamepad.
Play as a "head in a mech" harvested from the neck of everyone's favorite Space Hydra.
Roguelite catacombs that evolve and expand with each of your successes.
9 starting mechs to choose from with a wide range of abilities: time control, shot magnetism, perk randomization, and more.
5 difficulty levels ranging from "Relatively Easy" to "Nigh Impossible."
350+ items, including active weapons, one time use consumables, and passive upgrades.
150+ regular enemies, 10+ minibosses, and 20+ epic bosses.
500+ rooms to explore, including the special condemned survival rooms.
Level up during each run through the perk system which allows for varied build diversity.
Buy upgrades from a variety of shops.
Secrets! Among them "incredibilities" that massively change the way the game plays.
Over-the-top mod support. Detailed wiki: create enemies, items, weapons, and rooms.

wishlist: https://www.gog.com/wishlist/games/starward_rogue ,

https://www.youtube.com/results?search_query=starward+rogue+gameplay