• Add some kind of learning curve
• After playing your level for 100 times don't make it harder because it feels "too easy"
• Make sure not only one of your 3 items is actually useful
• Take the day after the LD off!

But it still was a great first event and next time I know the tools much better so I have more time to add those really cool features and balance it way better :-)

If anyone wants to be the first to actually finish the seemingly way too hard game, give it a shot: https://ldjam.com/events/ludum-dare/40/dont-be-greedy-1