This week I have been coming up with some new levels so that they can be quickly implemented as soon as the framework is in. Until I can play around with things, these are very rough because the levels might be too short, too easy, etc. I can still get rough levels down though, and that will greatly excel the process in the end.
The main issue I'm running into is making the levels challenging without being too difficult too quick. We will have at least 10 levels I believe, at an absolute minimum, and the difficulty has to slowly ramp up. Mostly, I have to make sure there isn't anything too crazy and to make sure that the level is beatable despite any potential random effects.