1 day: Not to much work but I have something in mind...

I've been traveling today and I haven't been able to code nothing but I have one idea to try for my first:
I'm going to write a platform/puzzle game were you have to compete with your "nemesis" trying to solve the puzzle in before your enemy.
I have in my mind something like VVVVV, but I'll try to do some "steampunk" ambient instead of "8 bits retro".

It will have different levels with different mechanics in each level. Some possible mechanics will be the next ones:
- Mirror level: The enemy will walk in oposite direction than your character.
- Collect the items before the enemy.
- No (or rare) gravity levels.
- ...

And if I have time I will try to do some local multiplayer, but I don't promise nothing!