Here’s a proper review of Omega Flowey Fight Simulator (assuming you’re referring to a fan-made browser or indie game based on Undertale ’s final boss):
Omega Flowey Fight Simulator is the gaming equivalent of eating a raw packet of frosting. It gives you the immediate sugar rush of one of the best boss fights of the 2010s, but it lacks the actual cake that made it so satisfying in the first place. It’s a fun distraction and a great community project, but it can never truly replace the soul of the original. Omega Flowey Fight Simulator
Contrary to what the name suggests, the Omega Flowey Fight Simulator is not an official DLC or a mod that requires downloading the original Undertale . In most cases, it is a fan-made or GameMaker Studio project designed to replicate the specific boss battle against Omega Flowey. Here’s a proper review of Omega Flowey Fight