Losting mushroom tiles is designed(mentioned in the Enlargement [?] detals). It likes other clicker game that can "restart " the game as a new playthrough while remains some effects (unlock new type mushroom tile).
To improve the experience, (1) give a notice more clearly; (2) remain more reward aftrer enlargement, maybe old mushroom tiles convert to resources by a rule; (3) make the Enlargement can be upgraded for some effects but not "restart", until it reach the max levels then the next upgrading is meaning "restart".