It's very buggy. I know you didn't get to finish it, but there isn't a goal in the game (or it isn't obvious), which I think is one of the more important things for a game if you want to players to continue playing for a longer time. I think using Roblox is fine, though you probably would have less players playing your game.
Also, it ain't cozy. The game clearly took inspiration from Doors, which isn't the exactly the most coziest game out there.