The game is about rules. On the surface, it will be a simple platformmer. Every ten seconds, a rule will be enforced out of a random set of rules.

The possible rules are as follows:

One must only double jump with a single heart remaining. (Lose one heart if you double jump, unless you have only one heart left)
One must not walk backwards. (Lose one heart when you move backwards while grounded)
One must avoid flowers. (Lose one heart when you walk on flowers)
One must not see one’s own hearts. (Can’t see your own health)
One must always run. (No longer double tap to start running, player always runs)
One must not harm trolls. (Lose one heart when you jump on trolls)
One must not look up on the hourglass. (Can’t see the counter until the next debuff)
One must not pickup hearts. (Hearts become -1 heart)
One must watch for falling stars. (Stars begin to fall from the sky for the remainder of the run)
One must not stray too far. (A moving circle appears, play must stay within circle or takes 1 heart of damage)

and finally…

One must reach the castle. (Only appears after the other debuffs have been activated, player has ten seconds to reach the castle before instant death)

I think the castle door may be closed until 100 seconds has passed, and you’ll be forced to wait for it to open while still obeying rules/dodging stars and staying alive.

Then if I have time, the boss fight will be 100 seconds of avoiding boss attacks while still obeying the rules, but every ten seconds a debuff will be REMOVED, and will fire at the boss as some kind of spell.

Sound good? Okay let’s go.