I just finished the game. Got in deadlocks twice:
-First one was going back to the lift (trough the empty pool) after being at the botanic garden. The lift went down, got out of fuel but there was nothing I could do to fix it again. Nothing much I could do at all.
-Second (not completelly verified - forgot to check if the door was really locked, but I don't have the savegame anymore and I simply reloaded at the time) was leaving the arcades too soon (only had 1 coin).
Those are not deadlocks! You simply don't try hard enough... The worse I've seen can be considered "glitches", those are just visual oddities that are not gamestopping.