[user23409]

The logging in barrier is a deal breaker for me.

Not saying you shouldn't keep it, just letting you know that some people will not get past it because they don't want to.

[kjhughes]

I think he allows a reasonable experience prior to having to log in. I watched his overview video (nice job), played the first level, and started designing a level without having to log in. Requiring account creation to save a level seems fine to me.

Overall, nice job, ttbmike.