I haven't had enough time to balance the game or make complex rules as the Compo was about to end, and the final game is quite hard. Tried it a few times and while I got close I still haven't "won" it.

Made up winning condition is to deliver eight drinks in one "lap". The game will let you play on though, no message or anything.

You can give it a go here: https://ldjam.com/events/ludum-dare/40/eight-more-drinks-please