I can think of several early access games that were either screwed up or abandoned. Space engineers was a huge disappointment, and starforge was completely abandoned.
The worst was robocraft. A promising FTP arena shooter, whose entire premise was that all the vehicles used you created. It was fun, with your opponents determined by the power of your creation. If you preferred fighting with smaller, less powerful machines, you could stick to smaller, weaker creations. Certain levels preferred certain kinds of robots. The game was reasonably popular, with a healthy player-base and a solid base to expand upon. In addition, as you leveled up, and these larger bots cost too many points to get into low level matches, preventing high tier players from dominating other levels.
The game got ruined because the dev screwed up the game 6 ways to sunday. They got rid of tiers in an effort to increase the number of players for games, which resulted in lower level players being stuck with players who could field larger bots. They then brought in the ability to sell your creations in game. This resulted in a handful of meta builds dominate the game, and the entire experience becoming P2Win, because these bots were insanely expensive unless you threw $$$ at the game for the premium currency. Now, they dont even have multiple levels of weapons/blocks, there is just a single level for every weapon/armor, ece, eliminating much of the reason to continue advancing, and further tilting the game in favor of $$$. They also eliminated the entertaining "MEGA" blocks completely, wiping out an entire set of bots from gameplay.