Thanks! Congrats for escaping the cell, it's not the easiest part!
Yes unless there is an unknown bug, it should be possible to continue after you escaped the jail.
Where are you stuck exactly? 1/ After going through the tunnel behind the metal plate, or 2/ did you open the door and could go back to the dump?
- In the first case, you should be able to walk to a deadend and find a key item. Use it with another item (spoiler: the spoon), then use the resulting item in the cell again.
- In the second case, talk to the agent who asks 3 things to let you pass. You need to buy plenty of things at the vending machine. If you don't have enough Coins, talk to Sonny who gives you a tip for a new minigame (with Phil again). Talk to Kikinou too who gives you Coins. Use the new items to repair the toy and to make a hat (wear it). Give a certain item to the Iron Giant and play with him. Give a certain item to Pim. When you have gathered 4 items that you can't use anywhere, put them to the recycle bin and obtain a complete access card.
Hope that helps! Please let me know if you're still stuck!