After purchasing the game, my first save file got softlocked at level 3 clearance, as I wasn't able to obtain level 4 clearance despite the mission being completed. My second save file got softlocked at level 2 clearance, as after unlocking level 3 clearance, I was unable to unlock any level 3 clearance quests despite finishing all of the level 2 clearance quests. In addition, many battles get softlocked (and must be aborted) in the middle when I click during enemy turns. I'm a Mac using Chrome if that helps the dev debug.
While the reproduction really is faithful graphically and playing it brings back memories, the fact that I can't seem to get to level 4 clearance due to bugs on both of my playthroughs means I can't in good conscience recommend buying this game.