Learned how important tutorials and letting somebody else play your game is. The game can be great, but if the person playing it gets stuck on the first section since they did not realise a mechanic exists they won't enjoy it. Played a bunch of games here and the game descriptions are a life saver, but having a mechanic be slowly introduced to you makes you feel smart for figuring it out instead of just reading it. TUTORIALS MAN
Viewing post in [SERIOUS] What did you learn while making your game?
Ahh I think I know what you're talking about. Your game had an invisible wall which told me I couldn't cross it, but I didn't expect I could go over it until I accidentally discovered how. Many players won't do that and will get discouraged.
A little direction goes a long way, though I agree it's fun to figure things out based on intuition. I like how Valve handles tutorials in their games: they imply what you need to do without interrupting the gameplay.